Rep. Jerry Nadler (D-N.Y.) is demanding an investigation into the detention of one of his staffers as Department of Homeland Security (DHS) officers entered his office.

The Wednesday incident took place as protestors gathered in a federal building that is home to both Nadler's office and an immigration court.

“DHS was upset that some of my staff members were watching them grab immigrants emerging from an immigration court in the same building, a floor -- a floor below. And they were upset that my staff invited some of the observers up to my office,” Nadler said during a Monday morning interview on CNN.

“They then came up to the office and demanded entrance. One of my staff members said, you can’t come in here, you need a warrant. They said, no, we don’t need a warrant, which is incorrec

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