CBS Evening News with Norah O'Donnell, 07/21

Coming up on the CBS Evening News - President Biden tests positive for COVID; we'll hear about his symptoms and how he's doing. Then - The January 6th committee teases a bombshell hearing in primetime detailing what President Trump was doing for more than three hours while his supporters attacked the Capitol. And in "Eye on America" - CBS News has exclusive access to Yellowstone National Park to see the damage from unprecedented flooding. We'll talk about how long it will take to repair. Norah O'Donnell reports on tonight's CBS Evening News Podcast.

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