OPINION OF THE COURT
In this case, we consider a challenge to a district court’s order remanding a diversity ease as improperly removed by a defendant who was a citizen of the forum state. Under the facts of this case, our jurisdiction to consider this appeal is inextricably intertwined with the district court’s authority to remand this action to state court, and thus we consider them together.
I.
Facts and Procedural History
On September 28, 1993, plaintiff Korea Exchange Bank, New York Branch, a citizen of New York State, filed a complaint against defendants Trackwise Sales Corporation, Moo Sung Ko, and Young S. Ko in the Superior Court of New Jersey, Bergen County, Law Division. All three defendants are citizens of New Jersey. In the complaint, Korea Exchange sought to recover on loans it made to defendant Trackwise and to enforce personal guarantees made by the two individual defendants. According to the complaint, the amount in dispute exceeds $300,000.
The complaint was served on Trackwise on December 28, 1993. On January 27, 1994, Trackwise filed a Notice of Removal in the United States District Court for the District of New Jersey, alleging diversity jurisdiction pursuant to 28 U.S.C. § 1332. The other two defendants were served after the removal. It appears that thereafter the case lay dormant in the district court for seven and one-half months, although there is a docket entry by a magistrate judge setting a scheduling conference for September 30,1994. On September 23, 1994, however, the district court sua sponte issued an order summarily remanding the case to state court. In that order, the court stated that “pursuant to 28 U.S.C. [§] 1441(b)” the case was “improperly removed because the defendant is a citizen of the State in which the action was originally brought,” and “this deficiency clearly appears on the face of the defendant’s Notice of Removal.” The court concluded that “pursuant to 28 U.S.C. [§] 1441(c)(4), this court should make an Order for Summary Re-mand....” Defendants filed a notice of appeal.
II.
Discussion
Korea Exchange contends that we lack jurisdiction over defendants’ appeal. It relies primarily on 28 U.S.C. § 1447(d), whiсh provides that “[a]n order remanding a case to the State court from which it was removed is not reviewable on appeal or otherwise_” In adopting 28 U.S.C.
*48
§ 1447(d), “Congress sought to make the judgment of a district court remanding a case final and conclusive in order to avoid the delay caused by appellate review of remand decisions.”
Liberty Mut. Ins. Co. v. Ward Trucking Corp.,
The leading case on the preclusion of review effected by section 1447(d) is
Therm-tron Products, Inc. v. Hermansdorfer,
Section 1447(e) was amended by the Judicial Improvements and Access to Justice Act of 1988 to impose a 30-day limit on the time the plaintiff has to file a motion “to remand the ease on the basis of any defect in removal procedure.” At the same time Congress deleted the “remand imрrovidently” language from section 1447(c). Thus, the relevant portion of section 1447(e) now reads:
A motion to remand the case on the basis of any defect in removal procedure must be made within 30 days after the filing of the notice of removal under section 1446(a). If at any time before final judgment it appears that the district court lacks subject matter jurisdiction, the case shall be remanded.
28 U.S.C. § 1447(e).
In
Air-Shields, Inc. v. Fullam,
Thus, under this court’s prior interpretation of
Thermtron,
we are precluded by section 1447(d) from reviewing remand orders based on “routine jurisdictional determinations,”
Liberty Mutual,
There is no dispute that defendants’ removal of this case did not comply with 28 U.S.C. § 1441(b), which provides that actions not involving federal questions “shall be removable only if none of the parties in interest properly joined and served as defendants is a citizеn of the State in which such action is brought.” 28 U.S.C. § 1441(b). Because defendants are citizens of New Jersey and the case was originally filed in New Jersey state court, the action was not removable.
The question before us then is whether this was a “jurisdictional” defect, which would bar our jurisdiction to review, or whether it was a “procedural” defect, whiсh Air-Shields holds is reviewable. Korea Exchange argues that because the district court’s “jurisdiction” is based upon the removal statute, the court lacks “jurisdiction” *49 over any diversity case that is removed by a defendant who is a citizen of the forum state.
Neither of the parties cites controlling Supreme Court precedent, but we are informеd by a series of cases in which the Supreme Court consistently refused to treat the removal statute as imposing independent jurisdictional requirements. For example, in
Baggs v. Martin,
A comparable issue involving a removed ease was presented in
Mackay v. Uinta Dev. Co.,
The Supreme Court rеsponded that where “there was the requisite amount and the diversity of citizenship necessary to give the United States circuit court [then the trial court] jurisdiction of the cause ... [t]he case ... resolves itself into an inquiry as to whether, if irregularly removed, it could be lawfully tried and determined.”
Id.
at 176,
The Mackay Court therefore recognized a clear distinction between the removal “process” and restrictions on the subject matter jurisdiction of the federal court over the case. The Court analogized the issue of which party brought the case to federal court to the typе of waivable defect such as “any irregularity in docketing the case or in the order of pleadings,” and distinguished that type of defect from one affecting the subject matter jurisdiction of the court, which was not waivable.
The rule emerging from these cases was followed in
Grubbs v. General Elec. Credit Corp.,
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The Supreme Court reversed. Relying upon
Baggs
and
Mackay,
the Court reasoned that where a ease has been tried on the merits without objection and judgment has beеn entered, the relevant issue “is not whether the case was properly removed, but whether the federal district court would have had original jurisdiction of the case had it been filed in that court.”
Grubbs,
Unlike this case, all three cases considered by the Supreme Court had already been tried before the removal to federal court was questioned. Nonetheless, the Supreme Court clearly suggested, even if it did not directly hold, that it does not view the removal statute as imposing independent jurisdictional restrictions on the federal courts. Rather, in considering whether jurisdictional defects existed, the relevant inquiry is whether the case could have been filed originally in federal court.
See, e.g., id.
at 704,
A similar approach was endorsed in
Thermtron,
where the Court suggested that courts determining whether a removal defect is jurisdictional for purposes of precluding review under 28 U.S.C. § 1447(d) should look to “whether the District Court would have had jurisdiction of the ease had it been filed initially in that court_”
Thermtron,
We conclude therefore that an irregularity in removal of a case to federal court is to be considered “jurisdictional” only if the ease could not initially have been filed in federal court. In this ease, there is diversity of citizenship between the parties and the amount in controversy is in excess of $50,000. Thus, there is no disрute that this ease could have been filed originally in federal court on the basis of diversity jurisdiction pursuant to 28 U.S.C. § 1332. The invocation of the removal machinery by a citizen of the forum state, while error, is not a “jurisdictional” defect under relevant Supreme Court precedent. Rather, it is a “defect in removal procedure” which cаn be waived.
Our conclusion that section 1441(b)’s bar against removal by a forum-state citizen is not jurisdictional is consistent with the conclusions reached by almost every other court of appeals that has addressed the issue.
See, e.g., In re Shell Oil Co.,
Because removal by a forum defendant in noncompliance with section 1441(b)
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does not deprive a federal court of subject matter jurisdiction, it is clear under section 1447(c) that this irregularity must be the subject of a motion to remand within 30 days after filing the notice of removal.
See, e.g., Shell Oil,
Korea Exchange emphasizes, but we find irrelevant, that in ordering the remand the district court erroneously cited to 28 U.S.C. § 1441(c)(4), a non-existent subsection, in support of its order of remand. It appears that the district court intended to rely upon 28 U.S.C. § 1446(c)(4), which provides:
The United States district court in which such notice is filed shall examine the notice promptly. If it clearly appears on the face of the notice and any exhibits annexed thereto that removal should not be permitted, the court shall make an order for summary remand.
Korea Exchange contends that because the defect in the removal by the forum-state citizen defendants “clearly appeared on the face of the notice,” section 1446(e)(4) provided authority for the remand. We believe defendants are probably correct that section 1446(c)(4) applies only to removals of criminal prosecutions, but even if it applies to civil cases, that section must be read in conjunction with the 30-day time limit impоsed by section 1447(c).
Thus we conclude that our review is not barred, if it was properly invoked. Defendants in this case filed a notice of appeal. In
Thermtron,
the Court suggested that where review is not precluded, issuance of a writ of mandamus is the “appropriate remedy to require the District Court to entertain the remanded action,” because “an order remanding a removed action does not represent a final judgment renewable by appeal.”
1
Id.
at 352-53,
Use of mandamus is appropriate “to confine an inferior court to a lawful exercise of its prescribed jurisdiction or to compel it to exercise its authority when it [has the] duty to do so.”
Roche v. Evaporated Milk Ass’n,
III.
Conclusion
To reiterate, if the removal by a citizen of the forum state meant that the district court lacked subject matter jurisdiction, the district court would not have been subject to the 30-day limit on remanding the case to the state court, and this court would have been barred from reviewing its action. Because the irregularity as to the party that removed the ease that fell within the district court’s diversity jurisdiction was a procedural defect, the district court was limited by the statutory 30-day time period on remand, and our review is not barred.
For the foregoing reasons, we will exercise our discretion to treat defendants’ appeal as *52 a petition fоr a writ of mandamus and will issue a writ requiring the district court to vacate its order of remand.
Notes
. Our decision in
Foster v. Chesapeake Ins. Co.,
