President Trump is open to additional tariff exemptions such as those he granted today to car makers, the White House said Wednesday, while again acknowledging tariffs could cause some economic disruptions.

Seesaw tariff announcements have unnerved Wall Street, as investors said flip-flopping moves by the Trump administration to roll back levies on trading partners were causing confusion rather than bringing relief.

President Donald Trump is on the verge of slapping new tariffs on Canada and Mexico while doubling a levy on China, moves that would dramatically expand his push to revive domestic manufacturing, tap new revenues and rebalance ties with the biggest US trading partners.