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"He is going to lose to Hillary regardless, he's demonstrated that already," McMullin added when asked if he'd feel guilty playing spoiler to Trump in a few states.

McMullin, 40, who served at the CIA for 11 years before working on Capitol Hill as a policy adviser for the House Republican Conference, launched his White House bid on Monday.

He immediately went after Trump as divisive and personally unstable and slammed Clinton as "a corrupt career politician who has recklessly handled classified information."

"I think they would both be absolutely terrible," McMullin told ABC's Tom Llamas.