Florida students head back to school amid debates over masks in the classroom, the Canadian border reopens to vaccinated Americans after being closed for over a year, Governor Cuomo’s attorney slams harassment claims as his top aide resigns.  » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful …

The U.S. reported more than 100,000 new COVID-19 cases in a single day for the second time in a week. SUBSCRIBE to ABC NEWS: https://bit.ly/2vZb6yP Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc Original source (ABC/Youtube)

Moderna has become the latest Covid-19 vaccine manufacturer to recommend a third booster shot as the delta variant continues to spread across the country. Assistant Professor of emergency medicine at Saint Joseph’s Hospital, Dr. Anand Swaminathan, joins News NOW to discuss calls for a third booster shot and whether Americans will need a booster for every emerging Covid-19 variant.  » …