Hong Kong (CNN Business) US President Donald Trump says China has agreed to cut tariffs on cars it imports from the United States.

Trump made the announcement in a tweet late Sunday in the United States, saying Beijing will "reduce and remove" the tariffs, which currently stand at 40%. He didn't specify when the change would happen or what the new tariff level would be.

White House adviser Larry Kudlow, director of the National Economic Council, said Monday that no agreement had been reached on what the new tariff would be, but he expected levies to plummet.

"We don't yet have specific agreement on that," Kudlow told reporters. "We expect those tariffs to go to zero."

Kudlow added that Chinese negotiators told the United States they would move "immediately" to remove tariff and non-tariff barriers without offering specifics on what sectors would be affected, but said he believed it would be tied to automobiles.