• Donald Trump told a story linking vaccination to autism, but there's no evidence that recommended vaccines cause autism.

• Former Arkansas Gov. Mike Huckabee said that Hillary Clinton was "under investigation by the FBI" because she "destroyed government records." Not true. She had the authority to delete personal emails.

• Trump said that "illegal immigration" cost "more than $200 billion a year." We couldn't find any support for that. Actually, it could cost taxpayers $137 billion or more to deport the 11 million immigrants in the country illegally, as Trump proposes.

• Trump again wrongly said that Mexico doesn't have a birthright citizenship policy like the United States. It does.

• Florida Sen. Marco Rubio said that U.S. policies to combat climate change would “do absolutely nothing.” The U.S. acting alone would have a small effect on rising temperatures and sea levels, and experts say U.S. leadership on the issue would prompt other nations to act.