News Hydroxychloroquine not effective; time to ‘move on:’ White House coronavirus testing chief Giroir August 3, 2020 William Cummings, USA TODAY Comments Off on Hydroxychloroquine not effective; time to ‘move on:’ White House coronavirus testing chief Giroir "I think most physicians and prescribers are evidence-based and they're not influenced by whatever is on Twitter," Adm. Brett Giroir said.