I stand corrected. My point still stands, though, and actually being a candidate gives him very strong speech protections. It's purest fantasy to think that he would face arrest for what he said, and not even rational to advocate he be hauled off to a stockade to face military tribunal. The military has no competence or authority to try speech cases involving civilians, and not even the most political military officers would want the case or agree to serve on that tribunal as judge, or jury. A few might be willing to serve as prosecutor, but not many. All of Trump's constitutional rights would still be in effect, and for a defense all he needs to do is point to the preamble to the Constitution. If the Framers could advocate for revolution in the nation's founding documents, he certainly can.