This man is a pathological liar. He doesn't know the difference between truth and lies. He lies practically every word that comes out of his mouth. And he had a pattern that I think is straight out of a psychology textbook. His response is to accuse everybody else of lying. He accuses everybody on that debate stage of lying, and it's simply a mindless yell. Whatever he does, he accuses everyone else of doing. The man cannot tell the truth, but he combines it with being a narcissist. A narcissist at a level I don’t think this country has ever seen. Donald Trump is such a narcissist, that Barack Obama looks at him and goes, ‘Dude, what’s your problem?’ Everything in Donald’s world is about Donald. And he combines being a pathological liar, and I say pathological because I actually think Donald—if you hooked him up to a lie-detector pass, he could say one thing in the morning, one thing at noon, and one thing in the evening, all contradictory, and he'd pass the lie-detector test each time. Whatever lie he’s telling, at that minute he believes it, but the man is utterly a moron.
- Sen. Ted Cruz, May 2016