Following Trump's tweet, Romney responded on Twitter, thanking the president for his support while stating that he hoped to earn the "endorsement of the people of Utah". In a blistering 20-minute speech urging fellow Republicans to do whatever they could to prevent Trump from securing the GOP presidential nomination, he called the candidate a "phony" and a "con man", adding, "He has neither the temperament nor the judgment to be president".
Romney's taunts provoked Trump to fire back by claiming the former presidential candidate nagged the New Yorker for an endorsement.
Romney told The Associated Press in a telephone interview Friday that he is on the same page policy-wise with the president but he'll be vocal if Trump does something he takes exception to.
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Democrats, despite not yet offering any credible threat to the Republican dominance in Utah, answered with a scathing rebuke, dismissing Romney's periodic criticisms of Trump.
Romney launched his bid for a political comeback on Friday, making official the rumors that he would run to replace Utah's retiring Senator Orrin Hatch, the longest-serving Republican in the Senate.
In his announcement, Romney made a veiled critique of the President's tone on immigration.
"Utah has a lot to teach the politicians in Washington", Romney says in the clip.
The two appeared to have patched up their differences since Trump's November 2016 election, when Romney was rumored to be in the running for Secretary of State and was pictured grimacing uncomfortably during dinner with the president elect in Trump Tower.
Romney also would be a compelling addition to the ongoing congressional wrangle over health care.