Canada Prime Minister Mark Carney takes questions from journalists after making a statement in Ottawa on Tuesday. Carney said on Tuesday that he was looking at "all options" amid the latest tariff tensions with the US. JUSTIN TANG VIA AP

WASHINGTON — The United States is set to impose new tariffs that could hit dozens of countries soon, trade envoy Jamieson Greer signaled on Tuesday, with President Donald Trump's temporary global levies due to expire this week.

The administration has prepared fresh tariffs targeting 60 trading partners over their alleged failures to act against "forced labor", as officials push to rebuild the US leader's trade agenda after legal setbacks.

"We expect to see some action soon," Greer told CNBC when asked if new duties were incoming. He did not specify a timeline.

Trump imposed a 10-percent global duty this year after many of his tariffs were struck down by the Supreme Court in February, but this levy expires on Friday.