President Trump declared on Wednesday morning that a U.S. trade "deal with China is done." The American leader offered a few key details of the agreement reached between senior U.S. and Chinese trade representatives in London on Tuesday,

Semiconductors are quickly taking their place as perhaps the world’s most coveted products.

The framework for the deal, which officials from the U.S. and China negotiated over two days in London this week, hinged largely on access to China’s exports of rare-earth magnets, coin-sized componen...