During the COVID-19 pandemic, he served under President Donald Trump as one of the lead members of the White House Coronavirus Task Force. Fauci's advice was frequently contradicted by Trump, and Trump's supporters alleged that Fauci was trying to politically undermine Trump's run for reelection. After Joe Biden took office, Fauci began serving as one of the lead members of the White House COVID-19 Response Team and as Biden's chief medical advisor. Fauci stepped down on December 31, 2022.
