Transgender people will be allowed for the first time to enlist in the U.S. military starting on Monday, as ordered by federal courts, the Pentagon said on Friday, after President Donald Trump’s administration decided not to appeal rulings that blocked his transgender ban.

Two federal appeals courts, one in Washington and one in Virginia, last week rejected the administration’s request to put on hold orders by lower court judges requiring the military to begin accepting transgender recruits on 1st January.

A Justice Department official said the administration will not challenge those rulings.

“The Department of Defense has announced that it will be releasing an independent study of these issues in the coming weeks. So rather than litigate this interim appeal before that occurs, the administration has decided to wait for DOD’s study and will continue to defend the president’s lawful authority in District Court in the meantime,” the official said, speaking on condition of anonymity.

In September, the Pentagon said it had created a panel of senior officials to study how to implement a directive by Trump to prohibit transgender individuals from serving. The Defense Department has until February 21 to submit a plan to Trump.

Lawyers representing currently-serving transgender service members and aspiring recruits said they had expected the administration to appeal the rulings to the conservative-majority Supreme Court, but were hoping that would not happen.

Pentagon spokeswoman Heather Babb said in a statement: “As mandated by court order, the Department of Defense is prepared to begin accessing transgender applicants for military service January 1. All applicants must meet all accession standards.”

In a move that appealed to his hard-line conservative supporters, Trump announced in July that he would prohibit transgender people from serving in the military, reversing Democratic President Barack Obama’s policy of accepting them. Trump said on Twitter at the time that the military “cannot be burdened with the tremendous medical costs and disruption that transgender in the military would entail.”

Four federal judges – in Baltimore, Washington, D.C., Seattle and Riverside, California – have issued rulings blocking Trump’s ban while legal challenges to the Republican president’s policy proceed. The judges said the ban would likely violate the right under the U.S. Constitution to equal protection under the law.