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Salt Lake City, Utah (AP) – Mitt Romney says Donald Trump lacks the temperament and the integrity to be president — and that the GOP should pick one of the other three candidates.

He says, the only serious policy proposals that deal with the broad range of national challenges we confront today, come from Ted Cruz, Marco Rubio, and John Kasich. “One of these men should be our nominee.”

He tells a University of Utah audience that “dishonesty is Donald Trump’s hallmark.”

The 2012 GOP presidential nominee says Trump imagined that he saw Muslims celebrating the September 11, 2001 attacks in New Jersey.

He adds: “His imagination must not be married to real power.”

Mitt Romney also says GOP front runner Donald Trump is dangerous – and a fake.

“The prospects for a safe and prosperous future are greatly diminished,”said Romney.

The 2012 GOP presidential nominee says the billionaire developer is not what he seems, saying, “A business genius he is not.”

(© Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)