The Trump administration announced today that it had finalized a plan to significantly reduce fuel efficiency standards for new automobiles. The move was a significant step in President Trump’s effort to reverse the Biden-era campaign to speed America’s shift to electric vehicles. Under the new rules, carmakers will be required to achieve an average fuel efficiency of 34.9 miles per gallon for cars and light trucks by the model year 2031. That’s far below the standard of 50.4 miles per gallon set by Biden, and pretty close to the levels that new cars already achieve.

President Trump has championed the scaled-back demands as a way to lower car prices. Critics argue that the change will cost drivers in the long run and reduce American manufacturers’ competitiveness. They also say the move will undermine efforts to address climate change, which Trump has called a “hoax.”

In other Trump administration news: Andrew Bailey, a deputy director at the F.B.I., is leaving the job after a little more than a year. In an internal memo, the F.B.I. said it believed that the hackers known as Shiny Hunters may have stolen sensitive information on all of its employees. The White House asked the Supreme Court to clear the way for federal prison officials to stop providing certain gender-transition medical treatments to transgender inmates.