Red states need to establish or improve the strength of their State Guards as a counterpart to the Federal military. The President is the commander in chief of the militia when called into Federal service, as outlined in the Constitution. Presidents have called the National Guard into Federal service in the past against the will of state governors, e.g., when Eisenhower and Kennedy took charge of the National Guard in several Southern states during the integration controversy.
For all the banter about secession, the fact remains that the states have little real control over the National Guard. Unlike 1775 or 1861, governors and legislatures have little but the state police to resist the Federal military.
Yes, but I do believe that the appointment and promotion of officers in the National Guard called to active service still falls under state control. If anyone knows otherwise, please correct me.