Closeup of United States Capital buildingPresident-elect Donald Trump nominated Jamieson Greer to serve as U.S. trade representative (USTR). Greer is currently a partner in the King & Spalding law firm. He was chief of staff for the USTR during Trump’s first term.

In his previous tenure with the USTR, Greer helped impose tariffs on China and others to combat unfair trade practices. During this time, NAFTA was replaced with USMCA. The Trump administration is tasking the USTR with reining in the massive trade deficits, defending American manufacturing, agriculture and services, and opening up export markets.

The announcement’s timing comes amid threats of import duties on Canada, Mexico, China, India, Brazil and South Africa. Over the weekend, Trump suggested 100% tariffs on BRICS countries if they backed a replacement for the U.S. dollar in international trade. These countries include Brazil, Russia, India, China, South Africa, Egypt, Ethiopia, Iran, and the United Arab Emirates.

The USDA forecasts U.S. food and ag exports to fall for the third straight year due to lower commodity prices and bumper crops worldwide. Exports of $170 billion this fiscal year would be the fifth highest on record. The strong dollar would help food and ag imports reach a record $215 billion.

Read more about Jamieson Greer here.