US President Donald Trump said Chinese leader Xi Jinping has agreed to restart the flow of crucial rare earth materials, after announcing a new round of US-China trade talks will be held in London on Monday.

U.S. President Donald Trump said on Friday that Chinese President Xi Jinping agreed to let rare earth minerals and magnets flow to the United States, a move that could lower tensions between the world's biggest economies.

Donald Trump has said he will visit China after speaking to its leader Xi Jinping over the phone.The US president said he had reciprocated with an invite to the White House during the "very good talk" - though such a trip has not been confirmed by either side.