US negotiators will aim to restore the flow of critical minerals when they meet their Chinese counterparts for a new round of trade negotiations Monday in London, a top economic aide to President Donald Trump said.

China has agreed to fast-track approvals for the shipment of rare earth minerals to the United States and some European Union nations.

The US trade war with China has a major sticking point: rare earths minerals. Last month, President Donald Trump said the United States needed Greenland “very badly,” renewing his threat to annex the Danish territory.