AdvertisementBiden Said He'd Walk Back Trump's WHO Walkout. Can All The Damage Be Undone?November 09, 2020Maria GodoyfacebookEmailThe World Health Organization, a U.N. agency founded in 1948, is headquartered in Geneva, Switzerland. Trump had pledged to withdraw U.S. participation by July 2021. Biden says he will rejoin on the first day of his administration. (AFP via Getty Images)