At the start of the hearing, congressional Republicans and Democrats clashed about whether the Trump administration had a national strategy to respond to the coronavirus pandemic.
Here are some of the highlights from the hearing.
"They've really got to jump all over that because if they don't then you might see the surge we saw in some of the Southern states", he told the AP.
Dr Anthony Fauci - who is leading efforts to supress Coronavirus in the United States - has said he is cautiously optimistic that the USA would have a safe and effective vaccine by the late autumn or early winter.
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Accompanied by a mocking "Dear Leader" graphic, Carlson said, "He's one of the forces behind the mass quarantines that tanked the economy and put millions out of work".
Fauci urged everyone to get vaccinated for COVID-19 to protect themselves as well as others from infection - to stop transmission and prevent future outbreaks.
The study of the first vaccine involving 30,000 people began this week.
"Some were followed very carefully and some were not".
Dr Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, said that 95 per cent of parts of European countries obliged when the shut downs first came into effect but only 50 per cent of the U.S. did.
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He tested positive for Covid-19 and was taken to an Atlanta-area hospital with "serious" symptoms. He had also been Chairman of the Kansas City Fed and CEO of the National Restaurant Association.
ANTHONY FAUCI: I think the American public should be assured that in the process of determining the safety and efficacy, the proper steps have been taken to determine that.
"And others that even did abide by it, the people that were in the state actually were congregating in crowds and not wearing masks", he added. "I'm not going to opine on limiting anything ... I'm telling you what it is - the danger - and you can make your own conclusion about that".
Discussing the key aspects that will help reduce in lag between the trials and manufacturing of COVID-19 vaccine, Dr Fauci said that it is important to ensure regulatory standards and review, harmonised data monitoring which will foster comparability, and financing the advanced vaccine production. He did not speak on whether ongoing protests have increased the spread of the virus, but stated, "You should stay away from crowds, no matter where the crowds are". Problems with the availability and timeliness of testing continue to be reported. Due to high demand, Giroir said the country can not guarantee that test results will be available within three days.
The hearing comes as the number of new COVID-19 cases keep appearing at a worrisome pace. "We're seeing far greater deaths from drug overdose that are above excess that we had as background than we are seeing the deaths from COVID", he said. Public health experts, including Fauci himself, publicly warned Trump against making such claims without evidence to support them. Dr. Heald-Sargent says that "we can't assume children are immune and we can't assume that children don't carry the virus".
"That study is a flawed study", Fauci said.
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When confronted with the fact it was peer-reviewed, Fauci demurred. "And I don't judge one crowd versus another crowd".