Story highlights The judge said the plaintiffs -- current and aspiring service members who are transgender -- are "likely to succeed" on their due process claims

The judge said that the effect of her order was to "revert to the status quo" that existed before the presidential memo

Washington (CNN) A federal judge on Monday partially blocked enforcement of key provisions of President Donald Trump's memorandum banning transgender people serving in the military.

Judge Colleen Kollar-Kotelly blocked provisions of the memorandum concerning the enlistment and retention of transgender military service members, holding that the plaintiffs "have established that they will be injured by these directives, due both to the inherent inequality they impose, and the risk of discharge and denial of accession that they engender. "

The judge also blasted Trump's initial abrupt announcement via Twitter that came "without any of the formality or deliberative processes that generally accompany the development and announcement of major policy changes that will gravely affect the lives of many Americans."

In partially granting a preliminary injunction pending appeal, the judge said the plaintiffs -- current and aspiring service members who are transgender -- are "likely to succeed" on their due process claims.

Photos: US military photos from September Photos: US military photos from September A pararescueman from the US Air Force's 48th Rescue Squadron scans the ground Tuesday, September 12, after Hurricane Irma hit the Florida Keys. The storm caused historic destruction across the state. Hide Caption 1 of 20 Photos: US military photos from September Sailors prepare an F-35C Lightning II on the flight deck of the USS Abraham Lincoln on Thursday, September 7. The fighter jet is still in the testing phase. Hide Caption 2 of 20 Photos: US military photos from September The New York Air National Guard helps American citizens evacuate the Caribbean island of St. Martin on Friday, September 8. St. Martin was among several islands that were devastated by Hurricane Irma. Hide Caption 3 of 20 Photos: US military photos from September An Air Force pilot and crew chief conduct a pre-flight inspection at a base in Krzesiny, Poland, on Monday, September 11. 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Deeter is part of a Marine band, assigned to the 3rd Marine Expeditionary Force, that performs throughout the Far East. Hide Caption 11 of 20 Photos: US military photos from September The USS Oscar Austin, an Arleigh Burke-class destroyer, travels in the Arctic Circle on Thursday, September 5. Hide Caption 12 of 20 Photos: US military photos from September Marine Gunnery Sgt. Philip C. Sackett escorts a US citizen to an evacuation control center at the Douglas-Charles Airport in Dominica on Sunday, September 24. The control center was set up to help people who were stranded on the island after Hurricane Maria. Hide Caption 13 of 20 Photos: US military photos from September Air Force Capts. Bryan Adams, left, and David Wilfong fly a C-17 Globemaster III to Puerto Rico on Saturday, September 9. They were delivering personnel and equipment to help with Hurricane Irma relief efforts. Hide Caption 14 of 20 Photos: US military photos from September Members of the Florida Air National Guard help people at a Jacksonville high school that served as a shelter during Hurricane Irma on Saturday, September 9. Hide Caption 15 of 20 Photos: US military photos from September US Marines participate in a live-fire training exercise near Djibouti on Thursday, September 7. Hide Caption 16 of 20 Photos: US military photos from September On the anniversary of 9/11, a military family based in Qatar honors those who lost their lives in the terrorist attacks. Hide Caption 17 of 20 Photos: US military photos from September Sailors drape a flag over the casket of Petty Officer 1st Class Charles Casto during a repatriation ceremony in Honolulu on Thursday, September 14. Casto was aboard the USS Oklahoma during the attack on Pearl Harbor, and his remains were recently identified. He was buried alongside his brother, Richard, who was also aboard the Oklahoma. 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The judge said that the effect of her order was to "revert to the status quo" that existed before the memo that was issued August 25. The memo indefinitely extended a prohibition against transgender individuals entering the military and it required the military to authorize, by no later than March 23, 2018, the discharge of transgender service members.

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