Strickland v. Washington, 466 U. S. 668, 688 (1984), to “ad-vanc[e] ‘the undivided interests of his client,’” Polk County v. Dodson, 454 U. S. 312, 318-319 (1981) (quoting Ferri v. Ackerman, 444 U. S. 193, 204 (1979)), and on the State a concomitant “constitutional obligation ... to respect the professional independence of the public defenders whom it engages,” 454 U. S., at 321-322 (footnote omitted). Once “the process loses its character as a confrontation between adversaries, the constitutional guarantee is violated.” United States v. Cronic, 466 U. S. 648, 656-657 (1984) (footnote omitted). Our commitment to the adversarial process, we have repeatedly recognized, is every bit as crucial on appeal of a criminal conviction as it is at trial. See, e. g., Douglas v. California, 372 U. S. 353 (1963); Entsminger v. Iowa, 386 U. S. 748, 751 (1967); Evitts v. Lucey, 469 U. S. 387 (1985). On appeal, as at trial, our Constitution guarantees the accused “an active advocate, rather than a mere friend of the court assisting in a detached evaluation of the appellant’s claim.” Evitts, supra, at 394 (citations omitted). See also Jones v. Barnes, 463 U. S. 745, 758 (1983) (Brennan, J., dissenting).
Naturally, the defense counsel’s duty to advocate, whether on appeal or at trial, is tempered by ethical rules. For example, counsel may not in his or her zeal to advocate a client’s case fabricate law or facts or suborn perjury, and must at times disclose law contrary to the client’s position. See
ante, at 440-441, and n. 14. Similarly, defense counsel have an ethical duty not to press appeals they believe to be frivolous, even though other lawyers might see an issue of arguable merit. See
Polk County, supra, at 323-324. For retained counsel, who may decline to represent a paying client in what counsel believes to be a frivolous appeal, the latter duty does not interfere with the duty of unwavering allegiance to the client. Since, however, court-appointed counsel may withdraw only with court approval, the indigent client who insists on pursuing an appeal that counsel finds frivolous presents a