Sources: White House And Health Officials Discuss Revising Mask

<p>Sources: White House and health officials discuss revising mask guidance as delta variant rages, vaccinations lag; Biden: Covid becoming a pandemic of the unvaccinated; White House targets rural United States for new vaccine push; Daily pace of people becoming fully vaccinated against COVID hits lowest point since January.</p><p>To learn more about how CNN protects listener privacy, visit cnn.com/privacy</p>