Is it necessary for a petitioner to show that his claim is not foreclosed by binding circuit precedent to obtain a certificate of appealability?

QUESTION PRESENTED In Slack v. McDaniel, 529 U.S. 473, 120 S. Ct. 1595 (2000), this Court held that a petitioner may obtain a certificate of appealability by showing that reasonable jurists could debate whether the petition should have been resolved in a different manner or that the issues presented were adequate to deserve encouragement to proceed further. To meet that standard, is it necessary, as the Eleventh Circuit Court of Appeals required, for the petitioner to show that his claim is not foreclosed by binding circuit precedent? i