Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (Utah) is the only Republican senator not on a congressional task force created by the White House to study reopening parts of the country shuttered by the coronavirus.

A list released by the White House on Thursday afternoon of the "Opening Up America Again Congressional Group" included nearly 70 senators, including all 52 of Romney's GOP colleagues in the chamber.

A spokeswoman for Romney and a source familiar confirmed that the GOP senator was not asked to take part in the task force.

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Trump has viewed the Utah senator, and 2012 GOP presidential nominee, as a Republican antagonist since he joined the Senate in 2019.

Romney was the only GOP senator to vote for one of the articles — abuse of power — during the Senate impeachment trial earlier this year.

But the bad blood goes back years. Romney was critical of Trump during the 2016 Republican presidential primary, and Trump lashed out at Romney in February 2016 as "one of the dumbest and worst candidates in the history of Republican politics."

The two appeared to reconcile with Trump considering Romney for a Cabinet post and endorsing his Senate bid in 2018.

But Romney has publicly broken with Trump at times since joining the Senate, including appearing critical of Trump's rhetoric regarding the late Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) and saying he was "sickened" by Trump's behavior as described in former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report.

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Romney's comments have made him one of the GOP senators most willing to break with Trump, after the death of McCain and retirement of former Sens. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) and Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.).

Trump has publicly lashed out at Romney, calling for him to be kicked out of the Senate GOP caucus and accusing him of being a "secret Democrat asset."

Romney wasn't the only senator not included on the new White House task force. More than two dozen Democrats were not included, such as Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), and Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), who both ran for the Democratic Party's 2020 presidential nomination. Red-state Democrats Joe Manchin Joseph (Joe) ManchinMomentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' Barrett seen as a front-runner for Trump Supreme Court pick MORE (W.Va.) and Doug Jones (Ala.) also were not included.

Updated at 5:10 p.m.