Only if the Commander in Chief orders that it be done.
Perhaps we can provide supplies as we do for hurricane relief, and even supply/build lots of tent cities on Mexican soil of course.
Process those that qualify for legal immigration and put their applications in the stack Return those that do not.
Such actions would completely deny the dems of the bad PR this is aimed to inflict on DJT. In the meantime, dems lose the PR battle as Americans see an invading force and finally understanding why we must have a secure border.
UPDATE; Mexico is just reportedly prohibiting further advances north. So, they have seen the light...all because of Trump's bold stance and reputation.