On Tuesday, former Vice President and presumptive Democratic nominee Joe Biden touted that President Donald Trump’s effort to develop a coronavirus vaccine in record-breaking time might not be effective.

Biden responded after Director after National Infectious Diseases and White House Coronavirus Task Force member, Dr. Anthony Fauci, announced that a coronavirus vaccine might be made available around fall, just in time for the upcoming 2020 Presidential election. Biden said that given Trump’s history of sharing false news and information about the vaccine, Americans are “not at all certain they’re going to take the vaccine.” He also doubted the validity of such studies by accusing the administration of moving it quicker than most experts think.

When he was asked how he could encourage Americans to get a vaccine, given that there is a growing distrust on the reliability and effectiveness against it, Biden used it as an opportunity to question the credibility of the vaccine. The Democratic nominee suggested that the only way to do so is to open the vaccine’s study for review under several international medical facilities, and have different expert opinions that it is safe for use.

Biden added that instead of providing assurance, Trump went about how the administration is preparing to release and distribute the vaccine. Biden added, “The way he talks about the vaccine is not particularly rational.”

On Friday, Fauci, a renowned world expert, assured that the speed of its development should not compromise public safety. Citing that it was “absolutely not the case,” Fauci added that the administration is already planning the vaccine’s quick distribution once it is approved. Fauci attributed the vaccine’s rapid development to the new technologies as well as the lack of bureaucratic red tape. The health director noted, ‘I don’t think it’s dreaming.” Fauci explained that based on animal and human data, they are “cautiously optimistic” that a vaccine might be distributed to the American public by 2021.

Trump also addressed the concern to radio show host Geraldo Rivera that a vaccine might be available by November 3 as various American companies have reached the final part of their three-phase clinical trial. The studies were a part of the President’s ed Operation Warp Speed, which involves a public-private partnership between several government agencies. Ultimately, their goal is to distribute the vaccine by January 2021.

Some of the vaccine candidates include pharmaceutical companies such as Pfizer and Moderna. Contrary to Biden’s claim that the vaccine did not undergo multiple studies, Trump believed that the two companies are not just well known, but that they are also well respected. Experts hoped that the vaccine would be 75 percent effective, although FDA will authorize companies as long as it can prove to be 50 percent effective.

Beyond saving lives, Democrats feared that a coronavirus vaccine could lead to Trump winning the upcoming elections. As a political writer, Bonnie Kristian forecasted in an op-ed column for the Week, that a vaccine would lead to the President’s electoral guarantee.