A day that began with President Trump tweeting an endorsement of Alabama Senate Republican nominee Roy Moore eventually led to Moore and former presidential candidate Mitt Romney exchanging insults on Twitter.

Or, put another way, Trump flew to Utah on Monday in an effort to make Romney's Senate plans more difficult to achieve so, it appears, Romney attempted to make it more difficult for Trump's preferred candidate in Alabama to reach the Senate. Romney has been reported to be considering a run for the Senate if Hatch retires.

Either way, Romney - the GOP's 2012 presidential Republican nominee - blasted Moore on Twitter on Monday afternoon.

"Roy Moore in the US Senate would be a stain on the GOP and on the nation," Romney posted on Twitter at 3:44 Central time. "Leigh Corfman and other victims are courageous heroes. No vote, no majority is worth losing our honor, our integrity."

Roy Moore in the US Senate would be a stain on the GOP and on the nation. Leigh Corfman and other victims are courageous heroes. No vote, no majority is worth losing our honor, our integrity. — Mitt Romney (@MittRomney) December 4, 2017

Exactly 33 minutes later, Moore responded.

"Either @MittRomney has lost his courage or he doesn't care about truth anymore. Sad day!

"America's reawakening was led by @realDonaldTrump, not you Mitt.

"#DefeatTheElite #DrainTheSwamp"

It's not immediately clear if Romney had motivation to criticize Moore on Monday other than the fact that Trump endorsed him earlier in the day. And while flying to Utah to make a speech and encourage U.S. Sen. Orrin Hatch to seek another term in the Senate - essentially blocking Romney's path to the Senate - Trump phoned Moore to give him his formal endorsement.

Hatch - who is nearing the end of his seventh term is the longest-serving member of the Senate -- traveled with Trump aboard Air Force One to Utah from Washington.

Trump's phone call ended, according to the Moore campaign, with the president saying, "Go get 'em, Roy!"

Romney, the former governor of Massachusetts, had already been on record opposing Moore in the aftermath of women alleging that, when they were teens, Moore made unwanted romantic and sexual advances on them.

Moore has repeatedly denied the allegations.

"Innocent until proven guilty is for criminal convictions, not elections," Romney posted on Twitter on Nov. 10 - the day after The Washington Post story first broke news of the allegations. "I believe Leigh Corfman. Her account is too serious to ignore. Moore is unfit for office and should step aside."

Innocent until proven guilty is for criminal convictions, not elections. I believe Leigh Corfman. Her account is too serious to ignore. Moore is unfit for office and should step aside. — Mitt Romney (@MittRomney) November 10, 2017

Corfman told The Post that, when she was 14, Moore undressed her and touched her over her underwear and guided her hand to touch him over his underwear.

Corfman last week provided to AL.com an open letter addressed to Moore, responding to the candidate's comments on Nov. 27 in Henagar where he said he never knew any of his accusers.

Romney was a frequent critic of Trump during his presidential campaign last year and Trump has privately expressed concern about Romney winning a seat in the Senate, Politico has reported.

Hatch, meanwhile, has been a strong supporter of Trump.