Keep in mind that Judicial Review (deciding if laws are constitutional or not) isn’t even a constitutional power. It’s one the court gave itself in Marbury v. Madison.

I assume what’s worse with the 300M scenario is that he still owes the other parties the 1.5B. Since the collateral is now gone, those parties will immediately demand full payment. So he’ll be forced to sell other properties to pay those debts, and it’s a cascade of a whole other set dominos of fire sales.