Environmental activists in Pennsylvania, one of 13 states potentially impacted by the administration's announcement, pounced on the news, saying it was "unlawful" and would have "far-reaching negative consequences" for the Keystone State.
President Trump said that San Francisco was in “total violation” of environmental rules because needles used by homeless people were ending up in the ocean.
Mary Nichols, the long-time chair of the California Air Resources Board, talks about California's continued efforts to stop the Trump administration's rollback of stricter fuel efficiency standards, and why the auto industry is on its side.
