The urgency of the El Salvador issue can be elevated in voters' minds by spotlighting Trump's statement that he wants more prisons built there to hold "the homegrown," and the fact that some U.S. citizens have already been detained at the border and imprisoned for a short period.

While Trump says he would send the worst of the worst criminals to a clone of CECOT, no such standard applied to the immigrants he sent there without a hearing or even a chance to call their relatives. They were supposed to be simply gone, forever. If he can get away with leaving those people there, what would stop him from snatching anyone for any reason, shipping them to a foreign gulag, then claiming to be powerless to extract them?