Mitt Romney excoriated Republican presidential frontrunner Donald Trump and called on primary voters to rally behind three of the remaining GOP candidates in each state where those candidates can best stop Trump. At a speech Thursday at the University of Utah, the 2012 Republican nominee warned voters against supporting Trump, whom he called a “phony” and a “fraud.”

“If we Republicans choose Donald Trump as our nominee, the prospects for a safe and prosperous future are diminished greatly,” Romney said. During his brief address, Romney criticized Trump for everything from his policy proposals (“flimsy at best”) to his personal character.