In a memo to top military leaders, Defense Secretary Jim Mattis said a high-level panel will determine how to implement Trump’s ban on transgender individuals in the military. Trump directed the military to indefinitely extend the ban on transgender individuals enlisting in the service, but he left it up to Mattis to decide if those currently serving should be allowed to stay.

Members of Congress have already sent a letter to Trump calling on him to reconsider the ban.

Sen. John McCain, the Republican chairman of the Senate Armed Services Committee, said Friday he backed legislation that would bar the Trump administration from forcing transgender troops out of the armed forces.