Just because he says it doesn’t mean he can do it without the request of the states. He did speak with all the governors today. He may have an agreement in place, however that does not change the Constitution. It has nothing to do with belief. Insurrection is not simply thugs looting and rioting. Insurrection means overthrowing the legal government. If any of these anarchists try to actually usurp the legally elected government, the US troops can be deployed. For "routine law enforcement" actions - like suppressing looting and rioting - the states must request assistance.