WASHINGTON — The European Union, Australia, Argentina, Brazil and South Korea are among the nations that will get an initial exemption from looming steel and aluminum tariffs from the Trump administration, U.S. Trade Representative Robert Lighthizer said Thursday.

President Donald Trump is planning to impose tariffs of 25 percent on imported steel and 10 percent on aluminum — trade penalties aimed at China for flooding the world with cheap steel and aluminum.

Lighthizer told the Senate Finance Committee that there are countries involved in various stages of trade talks with the U.S., and that Trump decided “to pause” the tariffs for those countries.

The trade official also cited Canada and Mexico in his list. The U.S. is in consultations with the two countries in an effort to renegotiate the North American Free Trade Agreement.

Trump moved on a separate trade front Thursday, paving the way for tariffs on China as punishment for what he said is the theft of American technology. He told reporters that the threat of the steel and aluminum tariffs was already having an impact.

“Many countries are calling to negotiate better trade deals because they don’t want to have to pay the steel and aluminum tariffs,” Trump said.

Lighthizer identified the countries initially exempted from the steel and aluminum tariffs in response to a question from Sen. Ron Wyden, D-Ore.

“There are countries with whom we’re negotiating, and then the question becomes the obvious one that you think, as a matter of business, how does this work?” Lighthizer said. “So what he has decided to do is to pause the imposition of the tariffs with respect to those countries.”