The Pentagon first raised the possibility of sending National Guard troops to the U.S. Capitol four days before the Jan. 6 riots, setting in motion a series of rejections by Capitol Police and Democrats that left Congress vulnerable as threats of violence were rising, according to government memos that validate Trump administration officials’ long-held claims.

An official timeline of the Jan. 6 tragedy assembled by Capitol Police shows that a Defense Department official reached out to a Capitol Police deputy chief, Sean Gallagher, on Jan. 2, 2021 to see if a request for troops was forthcoming, but the offer was quickly rejected after a consultation with then-Chief Steve Sund.