File photo taken on July 26, 2017 shows protesters against U.S. President Donald Trump during a demonstration in front of the U.S. Army career center in Times Square, New York. (Xinhua/AFP)

U.S. district judge Colleen Kollar-Kotelly in Washington D.C. said in the ruling that "there is absolutely no support for the claim that the ongoing service of transgender people would have any negative effect on the military at all."

Carl Tobias, a law professor at the University of Richmond, said the Trump administration is likely to take the case up to the Supreme Court, where it hopes the conservative majority bench will reverse the ruling, as in the case of the travel ban.

"This is a complete victory for our plaintiffs and all transgender service members, who are now once again able to serve on equal terms and without the threat of being charged," said Shannon Minter, who represented transgender service members.

White House Press Secretary Sarah Huckabee Sanders told a press briefing Monday that the Justice Department is reviewing the ruling.

The ban was cheered by conservatives but enraged liberals as well as the lesbian, gay, bisexual and transgender (LGBT) community, who said the discriminative policy was unconstitutional.

WASHINGTON, Oct. 30 (Xinhua) -- A federal judge on Monday blocked the transgender military ban proposed by the U.S. government, saying the policy was not backed by facts.

The ruling targeted a recent policy by the U.S. government that transgender people would not be eligible to enter the military starting March next year, on the grounds that transgender soldiers are "costly" and would cause "disruption."