December 8: How do vaccines hold up against Omicron — Savannah Guthrie speaks with Pfizer’s CEO. Instagram’s CEO to testify before Congress today. Major Amazon outage.

<p>Overnight, new details on the Omicron Covid variant — what we are learning about its spread, impact and how well vaccines work against it. Plus, Savannah Guthrie speaks with Pfizer’s CEO, Albert Bourla. Also, Instagram’s CEO is set to testify before congress today for the first time at a hearing focused on the impact of social media on young users. And, Amazon is dealing with the fallout of a major outage that caused issues across the internet — how this could have impacted your holiday deliveries.</p>