It may not violate the law, but it IS still immoral and unethical.

"Does Trump’s new border directive violate federal law?" PBS NewsHour 11/21/2018

Excerpt

SUMMARY:  More than 5,700 service members are providing support at the U.S.-Mexico border.  Now, the President has authorized troops to defend border patrol agents, “including a show or use of force (including lethal force).”  Nick Schifrin talks to former Army lawyer Geoffrey Corn, who teaches at South Texas College of Law Houston, about how Secretary of Defense James Mattis is walking a legal “tight rope.”