Jamieson Greer, Trump's pick for US trade representative, will play a pivotal role as Trump carries out tariffs hikes on Mexico, Canada and China.

Amid a Thanksgiving week filled with more talk of trade and tariffs than turkey, Trump has tapped a new U.S. Trade Representative with ties to his first administration. Jamieson Greer, who served as chief of staff to former USTR Robert Lighthizer,

President-elect Donald Trump picked Jamieson Greer to be U.S. trade representative, elevating a figure little known outside of Washington to what is expected to be one of the most important posts in the incoming administration.