Mitt Romney railed on GOP presidential frontrunner Donald Trump in a major address Thursday, calling him a "phony," "fraud," "con man," and "fake." Listing many of Trump's previous businesses, like Trump Steaks, Trump Airlines, and the controversial Trump University, Romney said Trump wasn't a "business genius." "Here's what I know: Donald Trump is a phony, a fraud," Romney said. "His promises are as worthless as a degree from Trump University," he continued. "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."