Wall Street's main indexes opened lower on Friday as trade worries deepened after U.S. President Donald Trump accused China of violating a tariff agreement, while investors assessed the latest inflation data.

President Donald Trump’s pauses and reversal on tariffs are sending markets on a roller-coaster ride. Consumers and companies would like to have the benefit of knowing where they stand in

Beijing said the decision to “aggressively” revoke Chinese student visas would “damage the image and reputation of the U.S.”

The flurry of punitive measures taken against China by the Trump administration over the last few days was prompted by a belief among US officials that China has failed to live up to commitments it made in trade talks earlier this month,

The administration had made immediate appeals to allow the U.S. to keep imposing stiff levies, and said the Supreme Court needed to intervene.

China welcomed the court's ruling. China's Ministry of Commerce called on the U.S. to remove the tariffs altogether, citing that they had negatively harmed global trade and U.S. consumers.