The Office of the U.S. Trade Representative will hear from more than 300 companies and trade groups this week and next during a lengthy hearing on President Trump’s threat to impose tariffs on roughly $300 billion worth of Chinese goods. While the marathon hearing is taking place, USTR Robert Lighthizer will appear before the Senate Finance and House Ways & Means committees. The Senate panel will get the first crack at Lighthizer on Tuesday in a hearing on the president’s...