Manhattan Rep. Jerry Nadler demanded an investigation into the Department of Homeland Security after agents briefly handcuffed one of his aides last week during a heated confrontation in his district office.

“This was totally unacceptable. The tactics were totally unacceptable. And they needed a warrant. And my office is a congressional office. It’s a completely separate branch of government,” Nadler (D-NY) raged to “CNN News Central.”

“I am demanding — I’m asking for an investigation,” he added, noting that he plans to ask House Judiciary Committee Chairman Jim Jordan (R-Ohio) for a probe “generally of ICE tactics, which are, frankly, very threatening to liberty.”

The incident took place May 28 after Nadler’s staff witnessed DHS agents detaining migrants in the building where the c

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