"The only time the narrative changed is after this administration came in, but elections that have been held with mail have found substantial fraud and coercion."
Biden's event was part of his campaign's effort to make the Nov. 3 election in part a referendum on the Trump administration's response to the outbreak.
"Each individual brings great professionalism to moderating and understands that the purpose of the 2020 debate formats is to facilitate in-depth discussion of major topics."