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National Institutes of Health Director Francis Collins told Congress Wednesday that no safety standards will be compromised as the government evaluates the three COVID-19 vaccines that have advanced to Phase 3 clinical trials. His remarks came a day after a group of pharmaceutical companies made a similar safety pledge and after Astra-Zeneca halted its vaccine study when a participant became seriously ill. The reassurances follow recent statements by President Trump that a vaccine would be available before Election Day, a claim that health experts widely dispute. We'll talk about the status of COVID-19 vaccine research.