Nominations of Michael N. Nemelka, Christian N. Weiler, and Alina I. Marshall : hearing before the Committee on Finance, United States Senate, One Hundred Sixteenth Congress, second session on the nominations of Michael N. Nemelka, to be Deputy United States Trade Representative for Investment Services, Labor, Environment, Africa, China, and the Western Hemisphere, with the rank of Ambassador, Executive Office of the President; Christian N. Weiler, to be a Judge of the United States Tax Court; and Alina L. Marshall, to be a Judge of the United States Tax Court, July 21, 2020