Mark Zuckerberg defends Facebook from Trump, plus the latest on coronavirus: CNBC After Hours

CNBC.com's MacKenzie Sigalos brings you the day's top business news headlines, and what to watch as the coronavirus pandemic continues to keep most of America on lockdown. On today's show, Mark Zuckerberg tells CNBC why Facebook is not an "arbiter of truth," and why political speech should be protected. Plus, CNBC's Robert Frank reveals what he learned from surveying the money habits of America's millionaires.