Everything You Need to Know About Thursday's Fox News GOP Debate

Romney Slams Trump: 'Promises Are as Worthless as Degree From Trump U.'

Donald Trump hit back at Mitt Romney this afternoon, declaring the former Massachusetts governor to be a "choke artist" who let the country down in 2012 by losing to Barack Obama.

In a speech at University of Utah today, Romney called Donald Trump a "phony" and a "fraud" and urged GOP voters to support any of the three other candidates.

The 2012 presidential nominee argued that Trump, if nominated, would enable Hillary Clinton to be elected president and that his policies, if implemented, would sink the country into a prolonged recession.

"Donald Trump is a phony, a fraud. His promises are as worthless as a degree from Trump University. He's playing the American public for suckers: He gets a free ride to the White House and all we get is a lousy hat," said Romney. 

Trump said Romney's thoughts on the race are "irrelevant" at this point, adding that Romney "chickened out" on a 2016 run. 

"He is a failed candidate. He failed horribly," said Trump, recalling that Romney begged for his endorsement four years ago.

"I could have said 'Mitt, drop to your knees.' He would have dropped to his knees," he said.

Trump eventually backed Romney and made a speech on his behalf in 2012.

Watch a portion of the remarks above and tune in tonight for the Fox News GOP debate, live at 9:00pm ET from Detroit.