Trump announced the ban in July 2017, reversing a decision by Barack Obama, which allowed transgender people to serve openly and receive medical care to transition genders.
Defending her tenure, Birx told CBS' "Face the Nation" on Sunday that she was at times censored by the Trump administration but denied ever withholding information.
The lawmakers said Trump “demonstrated that he will remain a threat to national security, democracy and the Constitution if allowed to remain in office.”
U.S. President Donald Trump has been impeached for a second time, but the process to remove him from office could take place after he leaves the White House.
Trump is on the verge of becoming the first president to be impeached twice, as lawmakers move quickly to punish him over last week’s deadly U.S. Capitol attack.