An army of 8,000 pro-Trump demonstrators streamed down Pennsylvania Avenue after hearing Trump speak near the White House. Sund’s outer perimeter on the Capitol’s west side was breached within 15 minutes. With 1,400 Capitol Police officers on duty, his forces were quickly overrun.“If we would have had the National Guard we could have held them at bay longer, until more officers from our partner agencies could arrive,” he said.
Source: Backup was denied, former Capitol Police chief says | The Seattle Times
Whoever is responsible for this failure has a lot of explaining to do.