The White House is almost ready to issue guidance to the Pentagon on the implementation of President Trump's proposal to ban transgender people from serving in the military.

The Wall Street Journal reported Wednesday that a White House memo will direct the Defense Department on details related to Trump's intention to bar transgender people from joining the military.

Under the new policy, Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE would have to consider a service member's ability to deploy in deciding whether to remove them from the military.

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Trump announced via Twitter last month that he would reinstate a ban on transgender military service that was lifted last year under former President Barack Obama Barack Hussein ObamaTwitter investigating automated image previews over apparent algorithmic bias Donald Trump delivers promise for less interventions in foreign policy Rush Limbaugh encourages Senate to skip hearings for Trump's SCOTUS nominee MORE.

Marine Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff, had clarified that there would be no practical modifications to Pentagon policies until the White House issued detailed guidance on the reimplemented ban.

“Our military must be focused on decisive and overwhelming victory and cannot be burdened with the tremendous medical costs and disruption that transgender in the military would entail,” Trump tweeted.

The president said at the time that he had made the determination after consulting with his "generals and military expert." The announcement, however, reportedly took Pentagon officials by surprise. Several members of the military openly opposed the decision.

The Pentagon said after Trump’s announcement that its policies would not change until the White House issued new guidance.

A Rand Corp. study commissioned last year estimated that there are between 1,320 and 1,600 transgender people serving openly in the U.S. military.

The announcement drew bipartisan condemnation, including from Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Ariz.), the chairman of the Senate Armed Services Committee, who admonished Trump for making such a proclamation on Twitter and defended transgender military service.

“There is no reason to force service members who are able to fight, train, and deploy to leave the military — regardless of their gender identity," he said in a statement.