U.S. Trade Representative Robert Lighthizer headlines a busy week, testifying before the Senate Finance and House Ways & Means Committees on the administration's trade agenda on Wednesday and Thursday -- his first time before the panels as USTR. Also this week, the Commerce Department will hold a hearing on the national security implications of aluminum imports and the United Kingdom and European Union will begin Brexit negotiations. Lighthizer will appear before the Senate Finance Committee on Wednesday to discuss his...