SHANGHAI — In the space of 24 hours, President Trump ordered American businesses to leave China and suggested in a tweet that he has the authority to do so.

Whether he has that power — he pointed to a national security law that has been used mainly to target terrorists and other major threats — is a question for Washington lawmakers and lawyers.

On top of that is the question of whether severing American businesses from China is at all feasible.

In the short term, it’s not. American business is deeply intertwined with China, and untangling it would be messy and potentially destructive for the global economy.