>> it really was a wake-up call for the intelligence community and the silos that existed that they weren't talking together like they should. >> reporter: it also reveals a significant lack of training for capitol police to deal with a threat like january 6th. as it became clear rioters would breach the capitol complex it took too long for other law enforcement agencies to gear up and respond. >> this was a moment for us, a singular event, and i say it's similar to what we saw on 9/11 where we had this attack on our soil. >> reporter: but while the report reveals a lot about what went wrong on that day, it does little to examine what led to the riots and in particular the role former president donald trump played in fueling the violence. >> with the exception of a brief reference to former president trump's remarks at the ellipse, senate republicans insisted that the report exclude anything having to do with the cause of the insurrection. >> reporter: sources tell cnn in order for the report to reach a