wasn't deployed earlier despite increasingly desperate requests from capitol police is one of the big questions about january 6th. and now there's a new potential explanation identified by the online forum just security. "senior military officials constrained the mobilization and deployment of the national guard to avoid injecting federal troops that could be remissed by the president to advance his attempt to hold on to power." one of the co-authors behind that extraordinary piece is ryan goodman, founding co-editor in chief of just security, professor at new york university school of law, and he joins me now. ryan, i found this piece really illuminating. let's start with just the problem to solve for here. it just was very clear both during the day as we were watching and in the aftermath that something has gone catastrophically wrong when the seat of the u.s. government can come under attack, violent attack for 3 1/2 hours and there are no reinforcements, there is no essential backup from the national guard to protect it. the question is why did that