U.S. Rep. Jerry Nadler said he wants a congressional investigation after a Department of Homeland Security officer handcuffed a staff at the Democrat's office in New York in the same building as immigration court.

Rep. Jerry Nadler (D-N.Y.) said Monday he will seek a congressional investigation after a Department of Homeland Security officer handcuffed one of his staffers at his office. Why it matters: The incident — part of a series of confrontations with federal immigration authorities — has further escalated tensions between congressional Democrats and the Trump administration.

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.