Pelosi's responsibility 

One thing that I don't think has gotten enough emphasis in the controversy about the January 6 riot/insurrection is Pelosi's responsibility for security at the Capital. It was her responsibility to call in troops or the national guard or extra police, not the Presidents. The reason lies in the Constitution. 

The Constitution provides for three separate branches of government, each with authority over their own security. The reasons are obvious to anyone familiar with history. The example of the Roman Republic. The emperors would surround the Senate with troops and then ask them their opinion on some matter. 

Their opinion was, naturally, favorable to the emperor. Such examples could be multiplied. 

The point should be obvious to anyone worried about Trump's dictatorial tendencies. Image if, instead of just inciting an unarmed crowd (unarmed. An unarmed insurrection. In the most armed country in the world.), he had been able to send troops under his control. The President can make troops available but they must be invited in and under the command of the leaders of Congress, mainly Ms. Pelosi. 

We have gotten into the habit of expecting all things to be taken care of by the President. The Founding Fathers were wiser men.