Can a defendant bring a claim of ineffective assistance of counsel?

To bring a successful claim of ineffective assistance of counsel, the defendant must show that his attorney's performance was deficient and that he was prejudiced by the deficient performance. United States v. Signori, 844 F.2d 635, 638 (9th Cir.1988); Strickland v. Washington, 466 U.S. 668, 687-91 (1984). When a defendant argues that his guilty plea was not voluntary because of the advice of his attorney, the defendant likewise must show that his attorney's performance "was not within the range of competence demanded of attorneys in criminal cases." Signori, 844 F.2d at 638.