1. Global Covid-19 cases have now topped 24m and deaths have surpassed 822,000. President Trump said he would expand access to a treatment using blood plasma from people who've recovered from the virus, but researchers warned that the therapy's benefits haven't been proven. 2. Delegates at the Republican National Convention renominated President Trump. 3. "With the data that we are presenting today, the case for mRNA-1273 to be one of the best or the best-in-class vaccines has gotten stronger." 4. Alexei Navalny, a longtime critic of Vladimir Putin, was evacuated to Berlin on Aug. 22 after falling ill from suspected poisoning on a flight to Moscow. Doctors treating the dissident said they found evidence of a toxin in his body and warned that he may suffer long-term damage.
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