In this Jan. 16, 2015, file photo, Mitt Romney, the former Republican presidential nominee, speaks during the Republican National Committee's winter meeting aboard the USS Midway Museum in San Diego. Romney charged into the increasingly divisive 2016 GOP White House sweepstakes Thursday, March 3, 2016, with a harsh takedown of front-runner Donald Trump. Gregory Bull AP
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In his Thursday remarks, Romney said Trump’s “domestic policies would lead to recession. His foreign policies would make America and the world less safe. He has neither the temperament nor the judgement to be president. And his personal qualities would mean that America would cease to be a shining city on a hill.”

Trump, Romney said, “relishes any poll that reflects what he thinks of himself. But polls are also saying that he will lose to Hillary Clinton.”

He added: “A person so untrustworthy and dishonest as Hillary Clinton must not become president. But a Trump nomination enables her victory.”

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The Washington Post’s Philip Rucker and Robert Costa contributed to this report. Larimer reported from Washington.