Again - the national guard is state directed. The governors of states deployed the national guard in their own states which is perfectly normal. Trump directed the DC national guard to deploy in DC which is mostly normal as well.

The obscene threat from trump was that he was going to deploy active duty military to states as well - which he hasn’t done and which would be unprecedented and extremely dangerous. He and Barr did take a half step by deploying other federal law enforcement in the capitol (DEA/BOP/DHS) which they likely did illegally as those organizations have no statutory authority in crowd control but the military would be an entirely new escalation and one that the joint chiefs / Esper seem to have talked him out of.