The Trump administration is considering whether to reduce certain tariffs targeting the auto industry that carmaker executives have warned would deal a severe blow to profits and jobs.

Over the past 24 hours, the auto industry has experienced some of the most extreme whiplash in the saga of the Trump administration’s tariffs, ending on Wednesday night with two contradicting policy proposals coming out of the White House: China may be granted exemptions on auto part tariffs, but Canada’s car tariffs might increase.

Powerful industry trade groups representing automakers, dealers and suppliers sent a joint letter Monday to top Trump administration officials warning of the devastating impact on the U.S. auto industry from tariffs that are set to go into effect on May 3.