Mr. Sund's revelation came during a 90-minute hearing before the Committee on House Administration's Subcommittee on Oversight.

In his first testimony before a House committee since he was forced to resign on Jan. 8, 2021, Mr. Sund detailed his deep frustration at not getting the National Guard help that would have been a "game changer" on Jan. 6.

Mr. Sund said in meetings with Mr. Irving and Senate Sergeant at Arms Michael Stenger on Jan. 3, he had asked them to approve his request for National Guard soldiers to help secure the Capitol on Jan. 6. Mr. Irving and Mr. Stenger made up two-thirds of the Capitol Police Board, which oversees U.S. Capitol Police and had to approve any such requests.

He met first with Mr. Irving.

"I went into his office, again 9:24 in the morning ... and immediately went up and said, 'Hey, I'd like to bring in the National Guard to support me on, to assist me on the perimeter because when we have a joint session of Congress, it takes a lot of our personnel inside,'" Mr. Sund testified.