Donald Trump has announced a complete ban on transgender people serving in the US military.
Trump said transgender individuals would be forbidden from serving in the armed forces "in any capacity."
The US President announced the prohibition on Twitter at around 2pm GMT, in a string of messages which have already garnered hundreds of retweets.
He wrote: "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 US 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."
Trump's announcement overturns the previous policy announced by the Department of Defense, which said that "transgender service members may serve openly, and they can no longer be discharged or otherwise separated from the military solely for being transgender individuals."
However the introduction of this policy had been delayed while the US military conducted a review into whether it would hinder the "readiness and lethality" of its forces.
On July 1 it was announced that the military would have another six months to conduct the review, although it did not affect those transgender troops who already served in the military.