Listen to Lake — declare an invasion and invoke war powers the states still have. Put guard on border. And SHOOT!
Mexico have a problem with that? Then Mexico must stop non-Mexicans from traveling thru Mexico for asylum in the US — in conflict with international law. Mexico still have a problem? Then assemble Mexican army on the border.
Wonder how the cartels would deal with two armies on a border?
So who pays for the Guard and all those Guardsmen who have to leave their jobs to watch the border?