And while most states in the US soon after followed suit, the Trump administration resisted calls to copy European countries and refused to put in place any sort of federally-mandated stay-at-home order.
"We know the body can make an adequate response against this virus" after 2 shots of a vaccine being evaluated, Fauci stated.
Fauci refused to be drawn into the politically sensitive debate while testifying before House lawmakers on the federal response to the coronavirus pandemic.
"The global need for a vaccine to help prevent COVID-19 is massive, and no single vaccine or company will be able to meet the global demand alone", Thomas Triomphe, executive vice president and global head of Sanofi Pasteur, said in a statement.
"Some were followed very carefully and some were not", Fauci said.More news: CD Projekt Red Squashes Rumor About A Beta For The Game
In an interview with The Associated Press earlier this week, Fauci said he was "disturbed" by the flat-out opposition in parts of the country to wearing masks as a public health protective measure.
"We hope that by the time we get into late fall and early winter, we will have in fact a vaccine that we can say that would be safe and effective", said the senior expert.
Mr. Trump rejected the medical expert's reasoning and instead claimed the US continues to see large numbers of new coronavirus cases because of the sheer number of tests being conducted, however.
"I can tell you that crowds are known, particularly when you don't have a mask, to increase the acquisition and transmission, no matter what the crowd is", Fauci responded.
The Times reported that Trump was annoyed that Fauci had been asked by the Nationals to throw a pitch so chose to one-up him.More news: Protesters killed at Pakistan-Afghanistan border
"You make all kinds of recommendations", Jordan retorted.
Fauci responded: "We were in agreement on virtually all of those". This testing, and what we have so quickly done, is used as a Fake News weapon.
"That study is a flawed study", Fauci said. "But no limit to protests, but, boy, you can't go to church on Sunday".
Robert Redfield, director of the Centers for Disease Control and Prevention, from right, Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, and Admiral Brett Giroir, U.S. assistant secretary for health, swear in to a House Select Subcommittee on the Coronavirus Crisis hearing in Washington, D.C., on July 31, 2020.
Reality check: The recent rise in COVID-19 cases was not just down to increased testing because the number of new infections has risen faster than the number of completed tests, Axios' Orion Rummler notes.More news: New York Liberty rookie Sabrina Ionescu suffered Grade 3 ankle sprain
The United States has recorded almost 1.8 million new COVID-19 cases in July out of its total 4.5 million known infections, an increase of 66% with many states yet to report on Friday.