U.S. military troops are prohibited from engaging in law enforcement activities within the nation's boundaries---a little thing called "Posse Comitatus." Evidently nobody has bothered to educate this illiterate nincompoop and malignantly narcissistic sociopathic toddler Trump on how to behave and be law-abiding while occupying the Office of the President.
There is no crisis at the southern border! Egomaniacal Trump, like a defiant born-rich spoiled-rotten tyrannical 3-year-old, simply does not want to let go of a stupid idea he used to stir up his white supremacist and white nationalist base: a giant 30' Neanderthal "wall" that, of course, Mexico will "pay for" ("no cost to the taxpayers," said pathological liar conman xenophobic bigot toddler-minded Trump) that no Texas landowner along the border is going to approve---not when it means the "gubmint" (government) can just swoop on down to Texas and take their land through Eminent Domain.
Coming to our borders is not illegal. In fact, there is a Bush-signed 2008 law that prohibits unaccompanied minor immigrants from Central America from being automatically deported the way we do Mexican kids. These UMIs, when they show up at our borders, are by law (Republican-signed law) required to be turned over to the Department of Health and Human Services for medical care, clothing, and placement either with relatives or in a safe home environment where the kids are then enrolled in school---it is mandatory. Why do Central American kids get special treatment based on the Bush-signed 2008 law? The four countries covered by the sanctuary law of 2008 are El Salvador, Honduras (known as the murder capital of the entire world), Nicaragua, and Guatemala, all of them plagued by widespread brutal gangs, corruption that goes all the way through the police departments and government, and abject dangerous poverty. In Honduras, for example, the poverty rate is 68% of the population, and in one report a cab driver had his face slashed with a machete for not being able to pay the daily $12 in "protection". One little boy witnessed a murder from the roof of his apartment building, and his mom fled in terror with her two babies to save their lives and hers. We, the American people, long ago made a promise that is etched in the words of poet Emma Lazarus:
"Give us your tired, your poor, Your huddled masses yearning to breathe free, The wretched refuse of your teeming shores. Send these, the homeless, tempest-tost, to me. I lift my lamp beside the golden door!"
Trump is a selfish spoiled brat who needs to be reminded that his own grandparents and two of his three wives immigrated seeking to breathe free---the grandfather (surnamed DRUMPF) fled a criminal past as a brothel owner and influence peddler in Nazi Germany). We are a nation founded by immigrants who fled Great Britain's religious (Protestant) oppression and sought to set up a free society where ALL FAITH CHOICES were equal, and all ethnicities accepted as part of our glorious MELTING POT nation that is OF, BY, and FOR the people.
There is no "invasion"---that is toddler-Trump hype to get his ugly spoiled-brat "candy" and no wise parent would let him have that candy right before a nutritious din-din.