“The United States...shall protect each [State] against invasion” U.S. Const., Art. IV, Sec. 4.
Trump says the military will secure the southern border until wall can be built!
All fine and dandy until the illegal group leaders find a few Judges to put on a stay on it; then it goes to SC and wait for a year until they decide to hear the case or not, which they may decline and in the mean time millions will be allowed to cross the border.