This piece explains why:

The Insurrection Act is a dangerous law that gives the president broad powers to authorize far-reaching uses of the military in the domestic sphere. It is based on highly permissive standards for action and provides neither a role for Congress nor a basis for serious judicial review….

The president in March issued an executive order that contemplated a legally contested federal takeover of federal elections to redress supposed “fraud, errors or suspicion.” Notwithstanding criminal laws that prohibit members or officers of the military from deploying troops to polling places, it is easy to imagine Mr. Trump issuing such orders in next year’s congressional elections on the claim of a president’s complete authority and control over the military to deal under the Insurrection Act with a “combination or conspiracy” that opposes or obstructs the execution of federal election laws.

If the president invokes the act, litigation will almost surely follow. States and localities could sue. But such suits will be very hard to win, given the sweep of the authority.

This is basically the formula for undermining the 2026 and 2028 elections in the U.S. Anyone who thinks Trump will ever voluntarily relinquish power does not understand Trump. At best, he might permit a loyalist to assume office, but that’s it.