Centers for Disease Control and Prevention Director Dr. Rochelle Walensky was forced to defend her agency’s guidance and even its integrity on Tuesday as Senate Republicans grilled her over CDC messaging on masks and other restrictions, arguing it’s frustrating and unreasonable as more Americans get vaccinated.

The Senate Health Committee hearing came hours after the Food and Drug Administration authorized coronavirus vaccinations for children ages 12 and up, widening the U.S. population that will be protected against the virus and bolstering chances for a safe return to full-time school in the fall.

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