Anthony Fauci's attorney rejected Sen. Ron Johnson's request to testify, arguing a second Senate appearance would amount to political harassment.
https://www.foxnews.com/politics/fauci-refuses-senate-appearance-invoking-fifth-amendment-100-times-covid-probe
https://www.foxnews.com/politics/fauci-refuses-senate-appearance-invoking-fifth-amendment-100-times-covid-probe