President Biden said the attack on the Capitol “has reminded us that democracy is fragile.” Above, Biden speaks during a visit Thursday to the National Institutes of Health in Bethesda, Md.

FILE – In this Feb. 11, 2021, file photo, President Joe Biden speaks during a visit to the Viral Pathogenesis Laboratory at the National Institutes of Health in Bethesda, Md. The Centers for Disease Control and Prevention on Friday, Feb. 12, is expected to release long-awaited guidance telling schools what measures are needed to teach in-person during the pandemic. Biden requested the updated guidance in response to complaints that the CDC’s school guidelines under the Trump administration were unclear and inconsistent. (AP Photo/Evan Vucci, File)