When reviewing a denial of a motion to suppress, how do we review the findings of the previous district court?

When reviewing the denial of a motion to suppress, we review the district court's rulings as to its findings of fact for clear error and apply de novo review to its conclusions of law. United States v. Boles, 914 F.3d 95, 102 (2d Cir. 2019). To the extent that a district court's determination may involve a mixed question of law and fact, we apply de novo review, including to any ultimate determination of whether the established facts satisfy the relevant legal standard. See United States v. Fiseku, 915 F.3d 863, 869 (2d Cir. 2018).