Whether the Ninth Circuit clearly erred in denying Hernandez-Ayala's request for a certificate of appealability

QUESTION PRESENTED Whether the Ninth Circuit clearly erred in denying Hernandez-Ayala’s request for a certificate of appealability because reasonable jurists would find it debatable whether Hernandez-Ayala could show cause and prejudice under Martinez v. Ryan to overcome the procedural default on the claim that trial counsel was ineffective for failing to investigate and discover critical impeachment against one of the State’s primary witnesses? i