“...the DHS guidelines are instructions for the nation’s immigration and border security officers as they administer the president’s directive.”
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Those “immigration and border security officers” should be advised that it is unlawful to carry out unlawful/unconstitutional orders. Using the defense that “I was just doing what my superior ordered me to do” is not sufficient. Remember the Nuremberg trials.
It does not matter what they do. If they make an arrest and send the alien to a detention center for removal proceedings the center will just release them and give them a court date in 2029.
Its been going on for years but now it will be accelerated.