China's President Xi Jinping pledged "self-reliance and self-strengthening" to develop AI in China, state media reported on Saturday, as the country vies with the U.S. for supremacy in artificial intelligence,

President Trump said he's spoken with Chinese President Xi Jinping about tariffs, but China says there have been "no negotiations" with the U.S. on trade or the economy.

President Trump is facing an adversary who has armed his country to play a long and potentially painful game in its contest with the U.S.