Between 2017 and 2021, Donald Trump had the world on a precipice, bracing for his next move, gaming out whether his bluster was a bluff, an overture to a deal or a break with history, as he sowed mayhem to push adversaries off balance.

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.

Lighthizer and Greer worked together at the Skadden Arps law firm before Trump was first elected in 2016. After Lighthizer was confirmed as U.S. trade representative by the Senate, he brought in his much younger colleague to be his chief of staff.