Sure, if you accept the fed's mobilization as legal. Which is the problem.
He needed to say the federalization was illegal, given that they were clearly being used for law enforcement, and force the guard to actually side with the constitution over the Executive branch.
This isn't going to end well unless the Left actually starts treating it as the civil war it is.
"Let the court decide if this blatant constitutional violation we see with our eyes is real or not" is not going to end with the constitution intact.