A children’s choir singing the national anthem at the U.S. Capitol had its performance interrupted by Capitol police who said “demonstrations” are not allowed, according to the choir’s director.

David Rasbach, the founder and director of the Rushingbrook Children’s Choir in Greenville, South Carolina, said he was “shocked” and stunned when the performance was disrupted on May 26.

“I couldn’t believe that was happening, that they would stop the national anthem of all songs,” he told the Daily Signal.

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Mr. Rasbach said he had permission from three congressional offices for the choir to sing in the Capitol — the offices of South Carolina Republican Reps. William Timmons and Joe Wilson, and the office of House Speaker Kevin McCarthy, California Republican.

Video of the choir singing in Statuary Hall shows an unidentified congressional staffer approaching Mr. Rasbach to cut them off before they could complete the fourth verse, because a female Capitol Police officer had directed the staffer to stop the singing, Mr. Rasbach told the Daily Signal.