What is the test for a finding of ineffective assistance of counsel in the context of plea negotiations?

We review a district court's findings of fact with respect to claims of ineffective assistance of counsel for clear error. See Chhabra v. United States, 720 F.3d 395, 406-07 (2d Cir. 2013). In the context of plea negotiations, we review de novo the district court's conclusion as to whether a counsel's performance violated a defendant's Sixth Amendment rights. See id. at 407.