The Department of Defense concluded in 2016 that there was no basis for the military to exclude transgender men and women from serving openly, subject to the same fitness requirements as other Americans, the ACLU said. New transgender recruits were due to be permitted to enlist on July 1, it said.

‘Critical roles’

Thousands of transgender Americans now serve in the armed forces, putting themselves in harm’s way to protect the rights and freedoms in the U.S., the ACLU said in the complaint.

"Some perform critical roles in intelligence analysis, disaster relief, medical care, and pre-deployment training at bases in the United States," the organization said. "Others have deployed to combat zones in Iraq and Afghanistan."

The plaintiffs in the suit include Petty Officer Brock Stone, 34, who has served in the U.S. Navy for 11 years, including a nine-month deployment to Afghanistan, and Staff Sergeant Kate Cole, 27, who has served in the U.S. Army for almost 10 years, including a year in Afghanistan where she served as a team leader and designated marksman.

Five members of the armed forces earlier this month sued Trump and his top military brass seeking to halt the reversal of the transgender policy put in place by the Obama administration. The new suit by the ACLU adds significant resources to the fight as the organization has seen its membership swell since Trump’s election.

The service members in the earlier case, who are suing anonymously, say they disclosed their gender orientation relying on the existing policy that permits them to serve openly.

Flash point

Treatment of transgender people has become a flash point as social conservatives lead fights in some states to require students and sometimes adults to use schools and public restrooms corresponding to their gender at birth.

In a three-part Tweet, Trump outlined his reasoning for reversing the Obama transgender policy. “After consultation with my Generals and military experts, please be advised that the United States Government will not accept or allow Transgender individuals to serve in any capacity in the U.S. Military. Our military must be focused on the decisive and overwhelming victory and cannot be burdened with the tremendous medical costs and disruption that transgender in the military would entail. Thank you.”

The ACLU included screen shots of the tweets in the complaint, saying they were were a "purely political" attempt to accommodate the most conservative legislators who support the president.

"The Trump administration has provided no evidence that this pronouncement wasbased on any analysis of the actual cost and disruption allegedly caused by allowing men and women who are transgender to serve openly," according to the complaint.

The Military Times pointed out that the cost of providing Viagra and sexual dysfunction medications to members of the armed forces is 10 times the costs associated with health-care services for transgender troops.

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