President Donald Trump has announced he's supporting Mitt Romney in the run for a US Senate seat in Utah.

Romney, who lost to Barack Obama in the 2012 election, has been an outspoken critic of Trump. 

The President tweeted Romney "will make a great Senator."

And the former GOP Presidential candidate was quick to thank him, in a rare bit of public harmony between the two rivals.

Romney has been an outspoken critic of Trump.

During the 2016 election campaign, he described him as a "fraud" who was playing the American public for fools.

Trump fired back, saying Romney "choked like a dog" in his 2012 campaign against Barack Obama, only to then briefly consider him as Secretary of State.

Name-calling aside, now they're moving toward a united front:

Congressional elections loom later this year and the President has repeatedly stressed the need to get more Republicans elected to push his policies through.

It's an agenda Romney said last week he largely supports: 

"I'm with the president's domestic policy agenda of low taxes and low regulation and smaller government pushing back against the bureaucrats. By and large, by the way, his policies are very similar to those I campaigned for," he wrote.

However he also warned he'll have no hesitation calling out President Trump if needed.

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