不知川普会不会这么做，如果打这个快牌

The “nuclear option” in this context likely refers to:

Withdrawing from the WTO
Under U.S. law, a president can withdraw from the World Trade Organization with only six months’ notice.
Leaving the WTO would allow the U.S. to impose tariffs without WTO constraints — but it would cause massive economic disruption.

This would not override the Supreme Court, but it would change the international legal environment.