The federal government does have a mechanism to activate a states national guard without a states input, but doing so activates them as Title 10 which means they basically turn into regular military personnel as opposed to a "states militia".

But that means they are also activated with all the rules and restrictions that come with being active under Title 10, which Drump is ofc ignoring.

Iirc, the intent for the mechanism is so the federal government can use state militias as a sort of emergency reserve unit OR if a states government has become non-functional because of a disaster/emergency whatever