It’s not known whether President Trump’s decision will affect the estimated 15,000 transgender people already serving openly in the US military.
The announcement was met with widespread confusion and condemnation, with critics branding it “cruel”, “petty” and an attack on servicemen and women who risk their lives to protect the United States.
Defense secretary Jim Mattis last month gave the military a six month extension on their review into whether allowing trans people to register would affect force readiness.
The military had asked for a two-year delay in the process, but this was denied.
Transgender people are welcome to serve in the British armed forces and are subject to the same mental and physical entry standard as any other candidate.
Announcing his decision on Twitter, President Trump said: “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 decisive and overwhelming victory and cannot be burdened with the tremendous medical costs and disruption that transgender in the military would entail. Thank you” Read in full from Mirror