When the Supreme Court killed his favorite tariffs in February, President Donald Trump rolled out temporary import taxes to replace them. But those stopgap levies expire in less than three months. Now the administration is scrambling to put more durable tariffs in place to keep revenue flowing into the U.S. Treasury and to shore up the president's protectionist wall around the American economy. Starting this week, the government will begin hearings in two investigations — one on countries that lag in enforcing bans on forced labor, another on overproduction — that will likely lead to a new round of U.S. tariffs.