A member of the Republican National Committee claimed Tuesday night in a letter to the other 167 committee members that Mitt Romney's anti-Donald Trump op-ed published hours earlier was an act of 'calculated political treachery' against the president.

Jevon O.A. Williams, the RNC member who represents the U.S. Virgin Islands, wrote that Romney could use 'loopholes' in the nominating process to openly challenge the president's re-nomination in 2020.

That, he wrote, would feed Romney's 'fantasy of being president, even if that means destroying our party and denying President Trump re-election.'

'With Republicans like him who needs Democrats?' Williams added. He confirmed in a phone call Wednesday morning that he sent the email but declined further comment.

In his Washington Post op-ed, Romney referred to Trump as 'the incumbent.' His niece, Ronna Romney McDaniel, is the Republican Party's chairwoman.

Jevon O.A. Williams , Republican National Committee member for the U.S. Virgin Islands, wrote in a scathing letter to fellow RNC committee members that Mitt Romney could use 'loopholes' in the party's nominating rules to challenge President Donald Trump's renomination in 2020; Williams is pictured at Trump's 2017 inauguration

Williams, who posed for a portrait with the Trumps at the White House during the 2017 Christmas season, warned that Romney is maintaining a 'fantasy of being president, even if that means destroying our party and denying President Trump re-election'

Romney will become Utah's junior U.S. senator on Thursday; he slammed Trump in an op-ed Tuesday as a moral failure who 'has not risen to the mantle of the office'

McDaniel appeared to take Trump's side in the dispute, tweeting Wednesday that '[f]or an incoming Republican freshman senator to attack @realdonaldtrump as their first act feeds into what the Democrats and media want and is disappointing and unproductive.'

Romney, the GOP's failed 2012 presidential nominee will become Utah's junior U.S. senator on Thursday, replacing reliable Trump ally Orrin Hatch.

He wrote that the president's 'conduct over the past two years, particularly his actions this month, is evidence that the president has not risen to the mantle of the office.'

An annoyed Trump tweeted Wednesday morning that Romney should '[b]e a TEAM player & WIN!'

'I won big, and he didn’t. He should be happy for all Republicans,' Trump jabbed.

In his letter, Williams asked fellow RNC committee members to issue a statement at their Winter Meeting this month declaring that Trump will be the party's presidential nominee in 2020.

He also wants to close what he calls 'loopholes' in the nominating process that Romney, Ohio Gov. John Kasich and outgoing Arizona Sen. Jeff Flake, all anti-Trump GOP moderates, could use to weaken the president in primary elections and caucuses.

'Look, the political history is clear. No Republican president opposed for re-nomination has ever won re-election,' he wrote.

'While President Trump would win re-nomination it wouldn’t come quick and it wouldn’t be inexpensive. Any contested re-nomination campaign—even a forlorn hope—would only help Democrats.'

Williams is a native of Antigua & Barbuda who earned U.S. citizenship through a dozen years of Army National Guard service.

In 2015 and 2016 he ran a presidential primary campaign in the U.S. Virgin Islands for onetime Trump rival Ben Carson, who is now secretary of of Housing and Urban Development.

Republican National Committee Chairwoman Ronna McDaniel is Mitt Romney's niece

Romney's op-ed clobbered Donald Trump; Williams' email went out hours later

The president cast Romney on Wednesday as a possible successor to Jeff Flake, the U.S. Senate's resident GOP critic of the White House

Williams is now a firm Trump supporter, defending the president's U.S.-Mexico border politices despite living on an island in the Caribbean.

'#BorderSecurity is a must! Build the wall!' Williams tweeted last month.

'President Trump wants to protect America and her citizens but the Democrats don’t want him to. #Treason,' he added a few days before Christmas as the hours ticked down to a partial government shutdown over funding for a border wall.

He tweeted on Tuesday that unnamed 'black media voices promote the liberal agenda which is in total conflict with the black agenda.'

And he took up Trump's crusade against a prominent CNN journalist in November, tweeting: 'Jim Acosta is a special person and by special I mean stupid. #FakeNews #EnemyofthePeople.'