President Donald Trump shakes hands with European Commission President Ursula von der Leyen, as US Commerce Secretary Howard Lutnick, US Trade Representative Jamieson Greer and White House Deputy Chief of Staff Stephen Miller clap after an announcement of a trade deal between the US and EU in Turnberry, Scotland, on July 27.

U.S. and Chinese officials agreed to seek an extension of their 90-day tariff truce on Tuesday, following two days of what both sides described as constructive talks in Stockholm aimed at defusing an escalating trade war between the world's two biggest economies that threatens global growth.

“IEEPA nowhere mentions tariffs, duties, imposts, or taxes, and no other President in the statute’s nearly 50-year history has claimed that it authorizes tariffs,” the companies added in a filing with the appeals court.