In the 30-second ad titled "Carefully", which was released on October 10, a narrator notes Trump's recovery from Covid-19 and includes a clip of Fauci, where he says: "I can't imagine that anybody could be doing more", The Hill news website reported.
The White House has not indicated that any additional safety measures will be taken to prevent the transmission of the virus among those travelling on Air Force One, at the event site or at rallies scheduled for Pennsylvania and Iowa later in the week.
Fauci added that he has been attempting to educate people-primarily younger adults-that the virus cannot only threaten their life, but the lives of others. "We have done a "phenomenal" job, according to certain governors".
"I mean, we're talking about all-hands on-deck is that I, I as one of many people on a team, I'm not the only person, since the beginning that we even recognized what this was, I have been devoting nearly full time on this - nearly full time", Fauci said.
On Sunday, Trump campaign spokesman Tim Murtaugh said in response, "These are Dr. Fauci's own words".
Trump's rallies often feature supporters who are standing close together without masks. Fauci's recommendations and assessments have largely been in line with public health experts throughout the coronavirus pandemic but not aligned with what the President perceives his political interests to be.
"There is no doubt about that", Fauci said when asked about President Trump's tweet comparing the disease to the seasonal flu.
The Trump campaign's commercial in question, which is running in the key battleground state of MI, was released last week after the president was discharged from Walter Reed National Military Medical Hospital following his coronavirus diagnosis.
National Football League postpones Broncos-Patriots game indefinitely
The Kansas City Chiefs at Buffalo Bills Week 6 game moves from Thursday, October 15 to Monday, October 19 at 5:00 p.m. Additionally, the Broncos are slated to play in 12 consecutive weeks, as their bye week is now Week 5.
"In my almost five decades of public service, I have never publicly endorsed nor do I now endorse any political candidates", Fauci told NBC News in a statement.
He said the Rose Garden event on 26 September, held to unveil President Trump's Supreme Court nominee, was a "superspreader event".
His impending return comes after the White House doctor said the president was no longer at risk of transmitting the coronavirus but did not say explicitly whether he had tested negative.
Fauci also said that the Covid-19 pandemic is far more serious than the seasonal flu.
Polling suggests Mr Biden has a single-digit lead over Mr Trump and an ABC News/Ipsos poll found that just 35% of Americans approved of how Mr Trump has handled the crisis.
The Trump effort published the newest advertisement last week following the President was discharged from Walter Reed National Military Medical Center after remedy for Covid-19.
On Monday night, Fauci reiterated his weekend criticism of the video, warning the campaign it will take to remove it. "And everything we've been through in the months since has proven that to be true".