Coronavirus cases continue to rise in the U.S.

With the number of Americans infected with coronavirus increasing, Dr. Sanjay Gupta answers questions about how many people are being tested and why he thinks the number of cases is only going to rise. Plus, after Joe Biden's impressive Super Tuesday showing, former New York City mayor Mike Bloomberg dropped out and endorsed the former Vice President. Tim O'Brien, Senior Adviser for Bloomberg 2020, joins AC360° to explain how Bloomberg is going to try and help Biden secure the nomination and possibly beat Pres. Trump. Airdate: March 4, 2020

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