U.S. stock futures slipped Sunday, ahead of a slate of new tariffs scheduled for this week and after President Donald Trump said he “couldn’t care less” if foreign automakers raise prices because of them.

WASHINGTON—President Trump said he “couldn’t care less” if foreign automakers raise their prices for U.S. consumers in response to new tariffs, doubling down on an aggressive strategy to remake the American economy with heavy tariffs set to go into effect this week.