U.S. President Donald Trump said he would impose reciprocal tariffs as soon as Wednesday evening on every country that charges duties on U.S. imports, in a move that ratchets up fears of a widening global trade war and threatens to accelerate U.

“Any steel coming into the United States is going to have a 25% tariff,” he told reporters Sunday on Air Force One as he flew from Florida to New Orleans to attend the Super Bowl. When asked about aluminum, he responded, “aluminum, too” will be subject to the trade penalties.