Brian Gragnolati: This vaccine news is 'a light at the end of the tunnel'

06:34

Doctor Amesh Adalja, a senior scholar at Johns Hopkins Center for Health Security, and Brian Gragnolati, the president and CEO of the Atlantic Health System, join MSNBC's Craig Melvin to react to the United States surpassing 250,000 lives lost due to the coronavirus and answer MSNBC viewer questions on the coronavirus vaccine.