So if you follow the logic of this administration (which I don't) you can construe the illegal immigrants as an invasion. You would assume that if there was an invading army that got dispersed and the stragglers were hiding out for years after the state surrendered, like some Japanese soldiers after WW2, as the law enforcement was trying to find and remove them, the jurisdiction would not apply to them. Then, there could be a wartime state sponsored guerilla force. Then, allegedly state affiliated guerilla force infiltrating without an official conflict, like Russians in Donetsk in 2015. You have to draw a line somewhere, and in theory it could be pretty far either way