The day after doubling down on his claim Barack Obama founded ISIS, Donald Trump now says he was being sarcastic.

Donald Trump repeatedly accused President Barack Obama of founding ISIS on Thursday, refusing to take back a patently false allegation even when questioned about the logic of his position.

Donald Trump's latest accusation against President Barack Obama — that he's putting sympathizing with or even supporting terrorists — is thrusting him into uncharted territory for the presidential candidate of any major political party.