Nothing at all wrong with that.
It would require congress to amend/repeal the Clean Air Act.
With government wide majorities, should be no prob...oh, wait.
California gets a special waiver from the Clean Air Act section 209 to set its own vehicle emissions standards. The EPA prevents states from setting their own rules, but CA has been getting waivers to set them more restrictive.
Trump's EPA...
I don't know. The woman in black is Marsha Blackburn. She's the witch responsible for RealID. That said I support this particular move by Trump. HT to @Anti Federalist for posting this.