Updated at 2:30 p.m. ETPresident Trump's would-be ban on transgender service members in the military has been blocked from going into effect for the foreseeable future.A U.S. district judge in Washington, D.C., decided on Monday that trans members of the military have a strong case that the president's ban would violate their Fifth Amendment rights. Judge Colleen Kollar-Kotelly granted a preliminary injunction to keep the policy from going into effect while the court case moves forward.As a result of her injunction, the military policy on transgender service members will "revert to the status quo," Kollar-Kotelly writes — that is, the policy that was in place before Trump's announcement. That policy allowed trans members currently in the military to serve openly and for openly trans people to be admitted to serve in the future.Kollar-Kotelly did not block the portion of the presidential memorandum that blocked military resources from being used to fund "sex reassignment surgical procedures," saying her court does not have jurisdiction over that policy.Before 2016, service members who came out as trans were "caught in limbo," as NPR has previously reported. They weren't eligible for promotion and were treated according to their gender assigned at birth. Troops who came out as trans could be discharged purely on the basis of their gender identity. Aspiring soldiers who were openly trans were considered unfit for duty.In June 2016, after lengthy deliberation, the Pentagon announced a policy change. "Effective immediately, transgender Americans may serve openly," then-Secretary of Defense Ash Carter said. And within a year, he said, the military would no longer turn away recruits on the basis of trans identity. (The deadline was later extended by six months.)Then, this July, Trump tweeted that "the United States Government will not accept or allow transgender individuals to serve in any capacity in the U.S. Military," an announcement that caught many people (including leaders at the Defense Department) by surprise.The tweet was followed by an official presidential memo in August. The memo called for trans members of the military to once again be eligible for discharge based on their gender identity and for would-be service members who are openly trans to be prohibited from joining the military, effective on Jan. 1, 2018.The memo did not go as far as Trump's tweets. For instance, whether individuals currently serving would be discharged, among other elements of implementing the ban, would be up to Secretary of Defense Jim Mattis, according to the memo. Any steps taken should be "appropriate and consistent with military effectiveness and lethality, budgetary constraints and applicable law," the instructions stated.Under the new preliminary injunction, this portion of the memo is unenforceable and the Pentagon policy is once again in effect. This means that unless the policy changes again, openly trans people could begin joining the military on Jan. 1.The lawsuit against the Trump administration was initially filed by five anonymous service members, "Jane Doe" 1-5, from different branches, with decades of collective service and multiple overseas deployments between them. The "Jane Doe" plaintiffs were later joined by a "John Doe."Two named plaintiffs, one at the Naval Academy and another in the Army ROTC, also joined the lawsuit as aspiring service members who, as openly transgender individuals, would be blocked from their career path by the president's memorandum.The judge ruled that the plaintiffs have persuasive claims that their Fifth Amendment rights are being violated and have a good chance of succeeding in their court case. She noted, among other things, that the president's policy was announced with little apparent deliberation, "disfavors a class of historically persecuted and politically powerless individuals" and contradicts the conclusions of military leaders.She also wrote "the reasons given for [the directives] do not appear to be supported by any facts" — for instance, there is "practically no explanation at all" about how trans service members would harm "unit cohesion," she wrote.The memo released by the president also prohibits the military from spending any resources on surgeries related to a service member's gender transition. Covering transition-related health needs was one of the policy changes the Pentagon announced in 2016.Kollar-Kotelly said she could not issue a preliminary injunction on that element of the memo because none of the plaintiffs in this case had proved that they would personally be harmed by that clause.The Human Rights Campaign called the injunction "an important step in the ongoing efforts to protect transgender service members."This case is not the only challenge to Trump's trans service member ban. The ACLU has a separate challenge pending in Maryland, on behalf of several named active service members."As all of these cases move forward, we will continue to work to ensure that transgender service members are treated with the equal treatment they deserve,"ACLU senior staff attorney Joshua Block said in a statement. Copyright 2017 NPR. To see more, visit http://www.npr.org/.