President Donald Trump revealed his most sweeping economic measure yet Thursday, announcing reciprocal tariffs that could come as soon as this spring, which Trump argues would level the playing field in global trade—though economists project they would increase inflation this year.

Trump spoke to reporters from the Oval Office about his decision, saying it was an “amazing day.” When asked if prices would rise as a result of the tariffs, he said that they “could go up somewhat” at first, but then “prices will also go down.”

President Donald Trump on Thursday rolled out his plan to increase U.S. tariffs to match the tax rates that other countries charge on imports, possibly triggering a broader economic confrontation with allies and rivals alike as he hopes to eliminate any trade imbalances.