President Trump would invoke other tariff authorities if his appeal of a trade court's ruling isn't successful, Commerce Secretary Lutnick said.

President Trump has a number of options at his disposal to implement tariffs, but none are as broad and aggressive as IEEPA.

Now a federal court has thrown a roadblock in his path. A three-judge panel of the U.S. Court of International Trade ruled Wednesday that Trump overstepped his authority when he invoked the 1977 International Emergency Economic Powers Act to declare a national emergency and plaster taxes — tariffs on imports from almost every country in the world.