Administration officials are warning of calamity if courts remove the sweeping tariffs President Donald Trump imposed on emergency grounds. Trump has used the International Emergency Economic Powers Act to place tariffs on goods from countries worldwide.

The warning comes as a federal appeals court hears arguments on the legality of his tariff policy. Trump added that if the court were to rule against him, “they should have done so LONG AGO,” claiming, “there is no way America could recover from such a judicial tragedy.”

The president has crowed about the billions of dollars collected so far from tariffs. That money could be at risk if the White House loses the legal battle.