From the cited article ...

... At that time, the U.S. Capitol Police told CNN that members of the public are prohibited from demonstrating on the Capitol steps without being accompanied by a member of Congress, and while Watson had been "escorted" there by a member, that member then "left the area." ...

The next day, Tuesday, August 18, Watson was detained again, CNN reported. ...

According to an Air Force spokesperson, Watson was "ordered into pretrial confinement" on Tuesday and was being detailed on a military hold at a facility in Maryland. ...

CNN asked the Air Force for more details about what specific misconduct allegations had been made against Watson, but did not receive a response. ...