When Trump plows through the guardrails, the issue will ultimately wind up at the Supreme Court. Thomas, Alito, and (probably) Gorsuch will support him, while the three liberals will oppose him. The outcome will be up to Barrett, Kavanaugh, and most importantly, the Chief Justice. Will Roberts stand up for the system, or will he, as I suggested in a previous post, twist himself into a pretzel in order to preserve the shell of judicial independence?
Roberts is a political animal, so I think the answer will depend largely on the polls. If Trump is popular, the Chief Justice will be strongly tempted to give him whatever he wants in order to avoid a constitutional conflict the Court might well lose. If not, the middle three will be more confrontational.