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.

The lawyer Jamieson Greer is set to be the top U.S. trade negotiator, a crucial position given the president-elect’s threats to impose tariffs on imports from other countries.

President-elect Donald Trump on Tuesday chose trade lawyer Jamieson Greer as his new U.S. trade representative, elevating a key veteran of his first-term trade war against China to execute a sweeping tariff agenda that promises to upend global trade.