What Mattered Today: October 3, 2019

The former U.S. envoy to Ukraine testified to Congress while President Trump publicly asked China to investigate Joe Biden, the E.U.'s top court ruled countries can force Facebook to remove content, and Las Vegas shooting victims and families reached a multi-million dollar settlement with MGM Resorts. Plus, a knife attack at a Paris police station killed four, Trump signed an executive order on Medicare, and the death toll from vaping-related illnesses reached 18. Catch up on these and more of today's top headlines.

What Mattered Today: October 3, 2019