On Greta Van Susteren's show last night, Donald Trump repeatedly said "good, solid proof" could convince him that Barack Obama was born in the U.S. but wouldn't get specific on what that actually meant.
VAN SUSTEREN: Hypothetically, is there anything that he could produce that would convince you that he was born in Hawaii?
Is there some sort of singular document or piece of evidence or any other information that you can think that could defeat your suspicion or even your thoughts that he was born elsewhere.
TRUMP: Sure, good, solid proof would be one of them. So far they haven't been able to do that.
VAN SUSTEREN: Like what?
TRUMP: Good, solid proof. And let's get back to jobs. Good, solid proof.