New U.S. Transportation Secretary Sean Duffy signed an order on Tuesday directing U.S. regulators to rescind landmark fuel economy standards issued under President Joe Biden that aimed to drastically reduce fuel use for cars and trucks.

The order is the latest Trump administration effort against Biden-era initiatives that intended to promote electric vehicles and reduce greenhouse gas emissions.

One of Sean Duffy’s first acts was to start dismantling rules demanding automakers hit fleet average of 50.4 mpg for cars by 2031

Sean Duffy was sworn in as the new Secretary of the U.S. Department of Transportation on Tuesday and one of his first acts in office was to sign a memorandum that begins the process of reducing automotive fuel efficiency standards enacted under the Biden administration.