In an interview with CNN's Anderson Cooper, McCain said his decision to keep his endorsement "depends on what (Mourdock) does."
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He clarified his comments following the debate, but it didn’t stop critics from weighing in. Mourdock countered that his remarks were misinterpreted.
McCain is yet another Republican asking for the candidate to apologize for the controversial comments. Presidential nominee Mitt Romney and gubernatorial candidate Mike Pence asked Mourdock to apologize Wednesday morning.
"I've made a few mistakes.. and I've asked for people's understanding and forgiveness when I own up to it," said McCain. "It's when you don't own up to it that people won't believe in you."
Mourdock continues to stick by his original comments.
“If it was because of a lack of clarity in my words, I truly regret it,” he said during a press conference Wednesday. “So many people mistook, twisted, (and) came to misunderstand the points that I was trying to make.”