It's complicated, BUT they were unarmed US citizens (defenseless women and children too).  The drugs, human smuggling, child smuggling, money laundering, deaths caused, mayhem and upheaval along our southern border WOULD NOT BE TOLERATED by any other 1st world country. We have been complacent because our elected officials allowed it and profited from it. This MUST change for us to achieve MAGA. I think Trump would be very wise to invade, clean it up and eventually hand it back. Make Mexico law abiding and prosperous. Their people will stop trying to escape to the USA in fear of life south of the border and those that did flee (for fear) will seriously consider returning to Mexico. And I am not a war monger, just a pragmatist. I think Trump is testing the waters in a very public way, the Mexican people will cry for AMLO to accept this generous offer. Unofficially he may yet accept it and we will can then clean it up with a vengeance.