This all stems from the EO Trump signed in January declaring a national emergency at the southern U.S. border
The theory is trump will invoke the Insurrection Act of 1807 on April 20, 2025, followed by him declaring martial law. (The Insurrection Act grants U.S. presidents the power to deploy the military into states for civilian law enforcement.)
He could theoretically do this if the "emergency" isn't solved after 90 days.
Even a month ago, I woild have said conspiracy rumor unthinkable.
Now...who knows?
https://www.snopes.com/news/2025/04/09/trump-martial-law-insurrection-act/