welcome back. president trump is defending his plan to revoke california s authority to set its own tailpipe pollution regulations. yesterday, on twitter, trump wrote this. there will be very little difference in emissions between the california standard and the new u.s. standard, but the cars will be far safer and much less expensive. many more cars will be produced under the new and uniform standard, meaning significantly more jobs, jobs, jobs. automakers should seize this opportunity because without this alternative to california, you will be out of business. the head of the epa and the secretary of transportation are expected to make the formal announcement today. the rollback would be a huge blow to climate regulation in california, the nation s largest auto market and has set pollution standards in the past that has influenced national and international policy. california has vowed to take the fight all the way to the supreme court and the attorney general