The Trump administration wants to all but eliminate Obama-era regulations designed to reduce vehicle emissions that cause global warming. That proposal could be rendered irrelevant if enough automakers agree to stick with the current, stricter standards before the rollback can be put into effect.

Background: The Obama-era rules, which require automakers to nearly double the average fuel economy of new vehicles by 2025, remain the single largest U.S. policy to reduce carbon dioxide emissions. Car companies fear that the proposed changes could mean building two separate vehicle lineups.

China is accused of a disinformation campaign

Facebook and Twitter said on Monday that they had removed accounts originating in China that had worked in a coordinated way to portray protesters in Hong Kong as violent and extreme.

It was the first time that the social media companies have taken down Chinese accounts linked to disinformation, a tactic used by Russia during the 2016 U.S. presidential election.

Background: Both Facebook and Twitter are blocked in mainland China, but not in Hong Kong. The Communist Party has largely not needed Western social media because it maintains tight control over domestic media and content.

Watch: Our video shows how China has portrayed the protests in Hong Kong as the work of outside influences, including the U.S.