Hahn, HHS in ‘tit for tat’ feud over Covid-19 messaging-politico: The dispute over whether to allow the use of blood plasma treatments for coronavirus on an emergency basis has set off what one senior official described as a “tit for tat” battle between Food and Drug Administration Commissioner Stephen Hahn and the leadership of the Department of Health and Human Services, with each side engineering the replacement of communications aides installed by the other.
