Paul pledges to spend 'every waking hour' trying to stop Trump
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Republican presidential candidate Rand PaulRand PaulTrump's CIA chief clears Senate Overnight Defense: Trump nominates Air Force secretary | Senate clears CIA director | Details on first drone strike under Trump Dems blast Trump plans for deep spending cuts MORE on Thursday pleged to spend "every waking hour" trying to keep rival Donald TrumpDonald TrumpSenate committee moving forward with Russia hacking probe Trump must re-engage Africa to halt Chinese inroads Voter fraud allegations reignite squabble MORE from winning the GOP nomination.

"Donald Trump takes us in the wrong direction. He would be a disaster. We’ll be slaughtered in a landslide," Paul said in an interview on the Alan Colmes radio show, as first reported by BuzzFeed. "That’s why my every waking hour is to try to stop Donald Trump from being our nominee."

Paul warned that the billionaire businessman is taking the GOP in the wrong direction.

"I think we, the Republican Party, becomes the party of angry people that insinuate that most immigrants are drug dealers or rapists, that’s a terrible direction for our party," he said.

"We’re never going to grow as a party. We’re never going to increase our vote among the Hispanic population, the black population, among women — all those things we need to expand our party."

But Paul said that he would still support Trump if he were to win the nomination, out of party loyalty.

"I'm a Republican, and I think if you don't support the nominee, it harms even those like myself. Because, for example, I was not the establishment pick when I ran for the U.S. Senate, but I agreed I would support them if they won, but they also agreed to support me, so it works both ways."

"It sounds terrible, 'Oh you're going to support Donald Trump,' but I expect Donald Trump to support me as well if I win."

The libertarian-leaning senator also pledged to stick it out with the GOP instead of supporting Libertarian Party candidate Gary Johnson, saying that "I’ve worked very hard to make the party more libertarian and more constitutionally conservative. And I think it’s been for a good thing.”