Lady Gaga, a long-time vocal advocate for LGBT rights, has spoken out against Donald Trump's ban on transgender people serving in the military. Gaga accused the U.S. president of "endangering lives" in a series of tweets on Wednesday afternoon.

"The message you have just sent has endangered the lives of people all over the United States and overseas bravely serving our nation," Gaga tweeted at the president. "Research says at least half of High School, University Students, & Employed Young People rarely or never discuss mental issues with anyone."

She continued: "Many of these young people are transgender and suffer daily from the exact types of social isolation and targeting your message encourages. Sincerely, did you know of the group you singled out today, 45% of them ages 18 to 24, have attempted suicide already? Within the Trans Community are many also who are strong and brave. They should be able to serve if they wish. To have honor if they do."

Read also: Lady Gaga Stops By NYC Bar to Comfort Fans Following Trump's Upset Victory

Lady Gaga was a vocal supporter of Donald Trump's rival Hillary Clinton during the election. "Our Republican candidate has done a good job of dividing the country in order to promote his campaign," she said. After Trump's upset victory, Gaga was photographed standing outside Trump Tower holding up a sign which read, "Love Trumps Hate."