evidence: And in the first week of September, Trump declared at a press conference: "Under Operation Warp Speed, we’ve pioneered groundbreaking therapies, reducing the fatality rate 85% since April." The claim was misleading, according to PolitiFact: One reason the fatality rate was much higher in April was that testing then was focused on those who were more severely ill and therefore more likely to die. The source of the 85% figure? A chart drawn up by Bhattacharya.