He said that the army cannot be inhibited by the enormous medical costs and the disruption that transgender people in the military would bring with them.
DOJ appealed all three of those decisions.
One of the lawsuits against the Pentagon policy has made its way to an appeals court, the San Francisco-based 9th U.S. Circuit Court of Appeals.
The Trump administration argued Friday that the Supreme Court should get involved in this case early because it "involves an issue of imperative public importance: the authority of the USA military to determine who may serve in the nation's armed forces".
Lower court judges have largely agreed, with judges in federal courts in Washington state, California and Washington, DC refusing to lift injunctions against the original ban to allow the updated policy to be enforced.
U.S. Solicitor General Noel Francisco filed a petition addressed to the Supreme Court on Friday, asking the justices to hear cases on Trump's policy regarding transgenders serving in the U.S. military.
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"The military has been forced to maintain [its] prior policy for almost a year", Francisco lamented, noting that "absent this Court's prompt intervention, it is unlikely that the military will be able to implement its new policy any time soon".
The Supreme Court's rules say that it will review a federal trial court's ruling before an appeals court has spoken "only upon a showing that the case is of such imperative public importance as to justify deviation from normal appellate practice and to require immediate determination in this court". "And absent this court's prompt intervention, it is unlikely that the military will be able to implement its new policy any time soon". "No one with the strength and bravery to serve in the us military should be turned away because of who they are", she said in a statement. The Trump government is of the opinion that this takes too long and has therefore stepped to the Supreme Court.
"As Americans come together and give thanks for the sacrifices made by our fearless service members and their families, the Trump-Pence administration is focused on undermining our military by tripling down on this discriminatory ban", said Rick Zbur, executive director of Equality California, which brought one of the successful suits against the ban.
Trump announced in March that he would endorse a plan by Defense Secretary Jim Mattis to restrict the military service of transgender people who experience a condition called gender dysphoria. "Yet again, the Trump administration flouts established norms and procedures".
The Supreme Court does not ordinarily intercede until at least one appeals court has considered an issue, and it typically awaits a disagreement among appeals courts before adding a case to its docket. He's declared that gender is only defined as the sex a person was assigned at birth and has since ended protections for transgender workers and prisoners.
However, the subject matter seems to be without precedent, meaning it's ripe for a Supreme Court review.