The tariffs U.S. President Donald Trump imposed last week on dozens of countries are expected to remain in effect rather than be reduced during ongoing trade negotiations, U.S. Trade Representative Jamieson Greer said Sunday.

New US tariff rates are "pretty much set" with little immediate room for negotiation, Donald Trump's trade advisor said in remarks aired Sunday, also defending the president's politically driven levies against Brazil.

President Donald Trump announced on Thursday he’s extending the existing tariffs with Mexico, America’s largest trading partner, and he will pause higher tariffs that were set to go into effect Friday.

On Thursday, Donald Trump announced sweeping new tariffs against U.S. trading partners that will go into effect next week. The announcement came on the same day that an appeals court grappled with the question of whether Trump’s tariffs are even legal.