Capitol Police arrested a staffer for Sen. Cory Booker who was carrying a gun Monday evening, as the New Jersey Democrat kicked off a marathon “filibuster” in the upper chamber.

The staffer, a retired law enforcement officer, was charged with carrying a pistol without a license, according to Capitol Police.

"The staff member, 59-year-old Kevin A. Batts of New Jersey, was arrested for Carrying a Pistol Without a License. All weapons are prohibited from Capitol Grounds, even if you are a retired law enforcement officer, or have a permit to carry in another state or the District of Columbia," the statement continued.