Watch live: Dr. Fauci, CDC Director Dr. Walensky and other health leaders testify before Senate on U.S. omicron response - CNBC

The top health leaders in the U.S.

will testify before the Senate on Tuesday about the federal response to the omicron Covid variant, as new infections and hospitalizations reach pandemic highs.

The Senate health committee will hear testimony from White House chief medical advisor Dr.

Fauci, Walensky and other health leaders testify before Senate on omicron response.

Pfizer CEO says two Covid vaccine doses aren't 'enough for omicron'.

Pfizer CEO says omicron vaccine will be ready in March.