“I don’t know any scientist involved in this effort who thinks we will be getting shots into arms any time before Election Day,” said the official, who is familiar with Operation Warp Speed, the federal government’s effort to develop coronavirus vaccines.

Trump, however, has projected optimism for a quicker timeline.

“[It’s] going to be done in a very short period of time — could even have it during the month of October,” the President said at a press briefing Monday. “We’ll have the vaccine soon, maybe before a special date. You know what date I’m talking about.”…

Dr. Larry Corey, who’s leading a group set up by the National Institutes of Health to work on coronavirus vaccines, also said he doesn’t think there will be a vaccine available by Election Day.

“I would agree with Dr. Slaoui. The chances are very low, very remote,” said Corey, who leads the COVID-19 Prevention Network.