In reviewing a denial of a motion to dismiss an indictment, what are the findings of fact and conclusions of law de novo?

In reviewing the denial of a motion to dismiss an indictment, we review the district court's findings of fact for clear error and its conclusions of law de novo. United States v. Bout , 731 F.3d 233, 238 (2d Cir. 2013). Where, as here, defendants challenge convictions based on unconditional guilty pleas, we understand them to have "admit[ted] all of the elements" of their claims and to have "waive[d] all challenges to the prosecution except those going to the court's jurisdiction." United States v. Yousef , 750 F.3d 254, 258 (2d Cir. 2014) (internal quotation marks omitted).