LAMP
It's not JUST for a photo-op or a distraction. It's more like a testing ground for when Trump generates an "emergency" in one or more blue states in order to derail the 2026 mid-term in those states indefinitely and thus secure his majority in the House.
Johnson nearly gave away the scam when he stated (ever so confidently) that the House would gain seats in 2026.
As for the legality of what he's doing in California right now, I seriously doubt the U.S. Supreme Court will come to the rescue. Trump is looking to set a precedent for his plans to stagecraft even more violent uprisings prior to the 2026 mid-terms during which time the House will be missing crucial Democrat Representatives.
It's Russia who needs the U.S. military control of Greenland to clear the path for Russia's advance into Eastern Europe
Orders to Trump from Moscow: Mr. Putin is getting tired of waiting!