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 Trump's tariffs order for countries yet to strike a trade deal with the U.S. went into effect just after midnight on Friday, though most levies aren't due to start until Aug. 7.Why it matters: While countries like Mexico struck trade deal extensions ahead of Trump's deadline,

U.S. appeals court judges sharply questioned on Thursday whether President Donald Trump's tariffs were justified by the president's emergency powers, as lawyers for states and businesses challenging the measures argued he exceeded his authority.