Rep. Jerry Nadler (D-NY) claimed he was “deeply disturbed” that one of his aides was briefly handcuffed by an officer with the Department of Homeland Security in his New York district office.

DHS officers entered Nadler’s Manhattan office Wednesday and put handcuffs on an aide whose identity remains anonymous. Another staffer captured the moment on video and is accused by an officer of “harboring rioters in the office.” The office claimed he didn’t need a warrant to arrest the aide.