Capitol riot hearing: D.C. Guard chief says 'unusual' restrictions slowed deployment of backup - The Washington Post

"It shouldn't take three hours to either say yes or no to an urgent request from either the Capitol Police, the Park Police, the Metropolitan Police Department," Walker said...

https://www.washingtonpost.com/national-security/capitol-riot-hearing/2021/03/02/a4867a48-7b81-11eb-85cd-9b7fa90c8873_story.html