“Within the next few weeks, and certainly by the end of the summer, we will see large parts of President Trump’s trade policy fully in effect.” Trump’s tariff strategy has also generated significant revenue for the U.S. government, although refunds tied to court rulings have reduced some collections. U.S. Trade Representative Jamieson Greer told lawmakers this week that while the administration had changed the legal authorities it was using, its overall trade strategy remained unchanged. “The specific authorities this administration is using have changed, but the trade strategy has not,” Greer told the U.S. Senate Finance Committee. Despite the administration’s effort to place tariffs on firmer legal footing, trade experts say Trump’s willingness to announce new duties unexpectedly remains a source of uncertainty for businesses.