*631This case is before us on remand from the Michigan Supreme Court for consideration of whether MCL 600.2963(8) is unconstitutional as it was applied to bar plaintiff's original complaint for superintending *800control. We conclude that it is. MCL 600.2963(8) cannot *632constitutionally be applied to bar a complaint for superintending control over an underlying criminal case if the bar is based on outstanding fees owed by an indigent prisoner-plaintiff from an earlier case and the prisoner-plaintiff lacks funds to pay those outstanding fees.
This case is before this Court because plaintiff, Douglas C. Jackson, filed a complaint for superintending control in this Court against defendant circuit judge, alleging that defendant failed to rule on a motion for reconsideration of an order in plaintiff's underlying criminal case. In an administrative order entered under MCR 7.211(E), this Court dismissed plaintiff's complaint under MCL 600.2963(8) because plaintiff owed outstanding fees to this Court from a prior case he brought in this Court that was subject to MCL 600.2963. Under MCL 600.2963(1), the provisions of MCL 600.2963 apply to civil actions and appeals in civil actions filed by indigent prisoners of the Michigan Department of Corrections. As relevant here, MCL 600.2963 provides that a prisoner, subject to the provisions of MCL 600.2963, who pursues a civil case or appeal in a civil case, is responsible for possible payment of an initial partial filing fee and for eventual payment of the remainder of the filing fee and that the fees be deducted from his or her prisoner account. See MCL 600.2963(3) and (5). MCL 600.2963(8) then provides, "A prisoner who has failed to pay outstanding fees and costs as required under this section shall not commence a new civil action or appeal until the outstanding fees and costs have been paid."
We initially denied plaintiff's motion for reconsideration of the administrative dismissal order, noting, in part, that plaintiff had not presented substantial legal argument to support a conclusion that application of *633MCL 600.2963(8) to bar the present original action was unconstitutional. In lieu of granting plaintiff's application for leave to appeal, the Michigan Supreme Court vacated this Court's orders dismissing the case and denying reconsideration of that dismissal and remanded the case to this Court "as on reconsideration granted, for plenary consideration of the plaintiff's argument that MCL 600.2963(8), as applied to his complaint for superintending control, is unconstitutional." In re Jackson , 503 Mich. 851, 915 N.W.2d 476 (2018). Therefore, at this point, the merits of plaintiff's complaint for superintending control are not before this panel. Rather, the question is whether it is constitutional to bar plaintiff from even pursuing the complaint for superintending control in this Court under MCL 600.2963(8).
Plaintiff has submitted a supplemental brief arguing that he should not be barred by MCL 600.2963(8) from proceeding. At our invitation, the Attorney General and the American Civil Liberties Union Fund of Michigan (the ACLU) have also filed amicus curiae briefs as to the present issue.1
Plaintiff and the Attorney General present substantially similar arguments that would effectively avoid the constitutional issue before us by construing MCL 600.2963 to be inapplicable to a complaint for superintending control that relates to an underlying criminal case. They argue that such a complaint should not be considered a civil action but that it is, instead, effectively part of the underlying criminal case.
*801We must reject this position. When interpreting a statute, unambiguous statutory language must be applied as written.
*634Ronnisch Constr. Group, Inc. v. Lofts on the Nine, LLC , 499 Mich. 544, 552, 886 N.W.2d 113 (2016). Court rules are interpreted "using the same principles that govern the interpretation of statutes." Ligons v. Crittenton Hosp. , 490 Mich. 61, 70, 803 N.W.2d 271 (2011). By its plain language, MCL 600.2963(1) applies the provisions of MCL 600.2963 to a "civil action" filed by a prisoner of the Michigan Department of Corrections; and by its plain language, MCL 600.2963(8) bars a prisoner who has failed to pay outstanding fees in a prior case subject to MCL 600.2963 from commencing "a new civil action or appeal" until the outstanding fees have been paid. Under MCR 3.301(A)(1)(a), a "civil action or appropriate motion in a pending action" may be brought to obtain superintending control. Plaintiff initiated this case by filing a complaint for superintending control. Under the plain language of MCR 3.301(A)(1)(a), that filing constituted the filing of a civil action. So under the unambiguous language of MCL 600.2963 and MCR 3.301(A)(1)(a), the provisions of MCL 600.2963 apply to this case as a matter of Michigan procedural and statutory law.2 Also, MCR 3.301(A)(1)(a), with its definition of an original action for superintending control as a civil action, was adopted before the enactment of MCL 600.2963. Thus, the Legislature is presumed to have known that the provisions of MCL 600.2963 would apply to a civil action for superintending control, even if the complaint was for superintending control of an underlying criminal case. See People v. Clark , 315 Mich. App. 219, 232, 888 N.W.2d 309 (2016) (explaining that the Legislature *635is presumed aware of, and to legislate in harmony with, existing laws when enacting new laws).
We now turn to the issue our Supreme Court's remand order directs this Court to decide: whether application of MCL 600.2963(8) to bar plaintiff's complaint for superintending control is unconstitutional. In a line of cases beginning with Griffin v. Illinois , 351 U.S. 12, 76 S.Ct. 585, 100 L.Ed. 891 (1956), the United States Supreme Court has considered issues involving the constitutionality of legal rules that bar an indigent person from seeking review in a higher court because of an inability to pay filing fees or fees for the preparation of transcripts, particularly in the context of criminal appeals. That Court has explained that these cases "reflect both equal protection and due process concerns" under the Fourteenth Amendment. M.L.B. v. S.L.J. , 519 U.S. 102, 120; 117 S.Ct. 555, 136 L.Ed.2d 473 (1996). "The equal protection concern relates to the legitimacy of fencing out would-be appellants based solely on their inability to pay core costs." Id .
Although M.L.B. involved an indigent person who was unable to pay record-preparation fees-which were required under Mississippi law before she could appeal the order terminating her parental rights-we find M.L.B. instructive in its discussion of the present state of federal constitutional law in this area. M.L.B. explains that the Court's earlier opinion in Mayer v. Chicago , 404 U.S. 189, 92 S.Ct. 410, 30 L.Ed.2d 372 (1971), emphasized that Griffin 's rule was a "flat prohibition"
*802in criminal cases against making access to "appellate processes" turn on the ability to pay. M.L.B. , 519 U.S. at 112, 117 S.Ct. 555.3 In *636discussing the right to have access to the courts in certain matters under the line of cases beginning with Griffin , the M.L.B. Court observed, "A 'precise rationale' has not been composed because cases of this order 'cannot be resolved by resort to easy slogans or pigeonhole analysis.' " Id . at 120, 117 S.Ct. 555 (citations omitted). We recognize that the matter before us cannot be resolved by "pigeonhole analysis" merely because plaintiff's action for superintending control is classified by Michigan procedural law as a civil action, i.e., technically a new civil suit by plaintiff against defendant. Nevertheless, we conclude that this case is an "appellate process" for the underlying criminal case for purposes of the federal constitutional right to access the appellate process in a criminal case.
Formalistic procedural labels aside, what plaintiff seeks in this superintending-control action is review by this Court, as the court immediately above the circuit court, of defendant circuit judge's alleged failure to rule on a motion for reconsideration in plaintiff's criminal case. Plaintiff asks this Court to direct defendant circuit judge to rule on that motion. This appears to be plaintiff's only option. Under Michigan procedural law, plaintiff has no means to appeal defendant circuit judge's failure to rule on a motion within a reasonable time because both an appeal of right and an application for leave to appeal first require a judgment or order of a lower court. See MCR 7.203(A) and (B). When a circuit court fails to rule on a motion, no such judgment or order is entered. But if a circuit court issued an order denying a motion in a criminal case, the criminal defendant would be able to file either a claim of appeal or an application for leave to appeal that order. See MCR 7.204 ; MCR 7.205. MCL 600.2963(8) would not apply to the filing of such an appeal in a criminal case. Indeed, as M.L.B. makes *637apparent, it would be unconstitutional, on the basis of an inability to pay fees, to preclude an indigent criminal defendant from filing a claim of appeal. Yet if a circuit court denied a motion in a criminal case sub silentio by perpetually failing to rule on the motion, MCL 600.2963(8) would, by its terms, bar an indigent criminal defendant from filing a complaint for superintending control if he or she owed outstanding fees to this Court for a prior civil case, even if the indigent criminal defendant had no means to pay those outstanding fees. This is an unwarranted distinction for purposes of the federal constitutional right of access to appellate review under Griffin and its progeny because, in either event, what is being sought is review by this Court, as the next-higher-level court, of an aspect of the criminal case. Thus, we recognize that this case is criminal in nature for purposes of the federal constitutional right of access to the courts in such cases. And given that function, a complaint for superintending control over an underlying criminal case must reasonably be recognized as an "appellate process" within the meaning of M.L.B. and Mayer , even though it is an original civil action, and not formally an appeal, under Michigan procedural law. We therefore hold that MCL 600.2963(8) is unconstitutional as applied when it is used to bar a complaint for superintending control seeking relief in an underlying criminal case where the indigent plaintiff is unable to pay the outstanding fees owed to this *803Court for a prior case subject to MCL 600.2963.
Review of plaintiff's most recent prisoner account statement shows plaintiff's account to have a zero current spendable balance and, for the previous 12 months, a zero average monthly deposit and a negative average monthly balance. Thus, it appears manifest that plaintiff is indigent and cannot pay the outstanding *638fees owed this Court for his prior case subject to MCL 600.2963(8). On the basis of the principles just articulated, plaintiff must be allowed to proceed with the present superintending-control action despite the outstanding fees from the prior case.
In its amicus curiae brief, the ACLU argues that application of MCL 600.2963(8) would be unconstitutional whenever it would bar an indigent prisoner from proceeding with a civil appeal or original action because of outstanding fees owed for an earlier civil case subject to MCL 600.2963. We decline to unnecessarily reach those arguments. We do note that in M.L.B. the United States Supreme Court referred to its earlier opinion in United States v. Kras , 409 U.S. 434, 93 S.Ct. 631, 34 L.Ed.2d 626 (1973), as clarifying that "a constitutional requirement to waive court fees in civil cases is the exception, not the general rule." M.L.B. , 519 U.S. at 114, 117 S.Ct. 555. We therefore emphasize that our holding is rooted in the heightened protection given to criminal defendants for access to the courts in criminal cases for purposes of securing the federal constitutional right to the appellate process. We leave as questions for another day consideration of issues related to the treatment of indigent prisoners by MCL 600.2963(8) in a civil case that does not seek relief related to an underlying criminal case and that is not otherwise provided heightened protection for purposes of access to the courts (like termination of parental rights matters as considered in M.L.B. ) and whether application of MCL 600.2963(8) only to prisoners and not to indigent nonprisoners raises equal-protection concerns.
In light of our holding that it was unconstitutional to bar this superintending-control action from consideration on the merits, we simultaneously with the issuance of this opinion enter an order allowing this case to *639proceed under MCL 600.2963. Consistent with the remaining provisions of MCL 600.2963 and this Court's customary practices for civil actions filed by prisoners of the Michigan Department of Corrections, that order formally denies plaintiff's motion to waive fees and directs the clerk's office to return his complaint for superintending control but allows him to proceed with this case by refiling the returned pleadings within 21 days after the date of that order (and this opinion).4 If plaintiff does so, he will be responsible for eventual payment of the appropriate overall filing fee for the present case through deductions from future deposits to his prisoner account, and the case will be decided on the merits. If plaintiff does not refile the returned pleadings, this case will be closed out by the clerk's office as if it had never been filed, consistently with MCL 600.2963(1).
We note that there is no inconsistency between our holding that MCL 600.2963(8) cannot constitutionally be applied under the circumstances here and application of the other fee-related requirements of MCL 600.2963. If plaintiff refiles his pleadings, this case will proceed to consideration on *804the merits regardless of whether the filing fee for the present case is ever completely collected from possible future deposits to plaintiff's prisoner account. It follows that imposing the requirement for potential future collection of the filing fee does not prevent plaintiff from having access to this Court on the basis of his present indigence. Also, our conclusion that this case must be recognized as criminal in nature for purposes of the federal constitutional *640right of access to the courts in such cases does not change its classification as an original civil action subject to the fee-related requirements of MCL 600.2963 (apart from an unconstitutional application of MCL 600.2963(8) ) by Michigan procedural and statutory law.
This case shall proceed in this Court consistent with this opinion.
O'Brien, P.J., and Boonstra and Cameron, JJ., concurred.