FILE PHOTO - Katherine Tai, U.S. President-elect Joe Biden's nominee to be U.S. Trade Representative, speaks after Biden announced her nomination during a fresh round of nominations and appointments at a news conference at his transition headquarters in Wilmington, Delaware, U.S., December 11, 2020. REUTERS/Mike Segar
WASHINGTON, Feb 25 (Reuters) - The trade relationship between the United States and China is "extremely difficult and getting more difficult," U.S. Trade Representative Katherine Tai said on Friday.
Reporting by Leah Douglas; Writing by Mark Weinraub, Editing by Franklin Paul
