Mr Greer told Bloomberg News the deal would cover a range of farm goods and add to an existing three-year agreement for China to buy 25 million tonnes of soybeans annually. He said the two countries would also set up a Board of Trade to oversee tariff cuts on about US$30 billion in goods.

The trade strategy, he said, aimed to steer exports toward sectors such as aircraft, soybeans, medical devices and energy. Mr Greer cited Mr Trump's remarks that China would order 200 Boeing planes and noted Beijing had renewed export licences for US slaughterhouses to sell beef.

Mr Trump and more than two dozen chief executives joined two days of meetings in Beijing, including a dinner with President Xi Jinping in the Great Hall of the People. The visit was seen as a pivotal moment in US-China relations, with officials urging trade to focus on less sensitive sectors.

Mr Greer did not specify what concessions Washington had offered in return. He said both sides agreed there would be "a certain level of tariff" but declined to give details. He added that China's new rules penalising foreign firms for shifting supply chains were a strong concern.

The Trump administration has launched two trade investigations to replace global tariffs struck down by the Supreme Court in February. Mr Greer said China would be watching how these compared with past agreements. He added there was willingness to extend rare earth export deals beyond October.