China's foreign ministry said on Monday that Chenyue Mao, the Wells Fargo banker who has been blocked from leaving the country, was involved in a criminal case and was obliged to cooperate with the investigation.

Stocks traded mixed Tuesday as longer-dated Treasuries rose following an inflation reading that rose in June from May despite being relatively tame. Tech stocks traded higher after Nvidia said it would restart some chip sales to China.

Wall Street analysts were positive after Nvidia (NASDAQ:NVDA) said it hopes to resume sales of its H20 chips to Chinese clients, citing U.S. government assurances that export licenses will be granted.

The US embassy in China has expressed concerns about damage to bilateral relations from exit bans, after Beijing prevented an American commerce department employee from leaving the country. The tensions over exit bans come as the two superpowers are locked in a trade war,