Trump Trade Chief Pushes for Order After Rocky Tariff Rollout

President Donald Trump’s top trade negotiator is attempting to inject order into sweeping new tariffs expected next month, after previous announcements roiled markets and fueled business uncertainty.

Through the past two months of tariff chaos — marked by false starts, confusion and presidential threats followed by quick reversals — US Trade Representative Jamieson Greer has largely been out of the picture. He was only confirmed to his role in late February, creating a void filled by White House adviser Peter Navarro and Commerce Secretary Howard Lutnick to handle messaging.

Greer — a cool-headed, legal-minded acolyte of Trump’s first-term trade ...