Luis Raul Vicente Fonseca, proceeding pro se, appealed the district court's denial of his motion to dismiss his criminal indictment. Fonseca argued that the district court lacked subject-matter jurisdiction, attempting to invoke Federal Rule of Civil Procedure 12(b)(1) and (h)(3). The underlying criminal case originated in the Southern District of Florida with docket number 1:19-cr-20844-RNS-1. Before this appeal, Fonseca had already pursued a direct appeal of his conviction, which the Eleventh Circuit affirmed and issued a mandate for in 2023. The government moved for summary affirmance, arguing that the district court had no power to entertain the motion at this stage.
The Court granted the government's motion for summary affirmance, noting that the position was clearly right as a matter of law. The opinion clarifies that the Federal Rules of Civil Procedure have no application to criminal actions. While Federal Rule of Criminal Procedure 12(b)(2) allows a defendant to argue lack of jurisdiction at any time while the case is pending, the Court determined that Fonseca's case was no longer pending. The mandate had issued following the direct appeal in 2023. Citing United States v. Elso and previous Eleventh Circuit orders in this specific case, the Court held that once the mandate issues, the district court loses authority to consider jurisdictional challenges under Rule 12(b)(2). Consequently, the district court lacked the power to consider Fonseca's motion.
The decision confirms that once an appellate mandate issues in a criminal case, the district court is divested of jurisdiction to entertain post-conviction motions challenging subject-matter jurisdiction under Rule 12(b)(2). This reinforces the finality of appellate mandates in criminal proceedings and limits the ability of defendants to raise jurisdictional defects after the direct appeal process has concluded and the mandate has been issued.