Regular military should never be used for law enforcement. It is a horrible precedent and dangerously opens the door to tyranny. Also, putting regular military in law enforcement roles degrades combat readiness and preparedness by taking away time and resources for combat training. And for those who say the migrants are an invading army, it is not. It may well contain some criminals but that does not warrant military intervention by our armed forces, it warrants intervention by civilian law enforcement who are properly trained to handle such situations. Add in federal law forbidding the use of the military for domestic law enforcement, and one can plainly see that the request was both illegal and unwise. For those who say Mattis is a coward, you are all wrong. He is actually showing courage of conviction and doing what is both wise and legal.