Sen. Ben Cardin on Monday evening said he’s “terribly angered” and “disappointed” by reports that a now-former staffer had taken part in sexual activities in a Senate hearing room, which were captured on video.

“I understand the Capitol Police are doing an investigation,” Cardin told reporters, adding that his office is “absolutely” cooperating with the Capitol law enforcement. Cardin says he has not been individually contacted by Capitol Police.

Cardin said the tape was brought to his attention this weekend, adding that he does not know whether the staffer — identified as Aidan Maese Czeropski — had somehow booked the room. Czeropski is no longer with the senator’s office. The tape was first reported by the Daily Caller.

“My knowledge of this was over the weekend. When I learned about it, made sure that he was separated. So he left the Senate employment, and the appropriate steps were taken from the point of view of our office,” Cardin said.

Cardin, who is retiring after this term, would not go into detail about how well he knew the staffer.

“I’m not going to get into my relationship with staff people,” he said, noting that it’s a personnel issue.