By KELIN DILLON On Wednesday, Jan. 12, U.S. legislators sent a letter to the head of U.S. Trade Representative (USTR) Katherine Tai protesting purported repeated infractions of the United States-Mexico-Canada Agreement (USMCA) committed by partner countries Mexico and Canada, going so far as to directly ask for intervention by U.S. President Joe Biden’s administration into the issue.  Highlighting delays and