The issue leaked into the race for President, as former Vice President Joe Biden told reporters in Delaware that the lack of testing was a major shortcoming.
“The administration’s failure on testing is colossal,” said Biden, who described it as a “failure of leadership, planning and execution.”
While Fauci raised questions about testing, he stood strongly with the White House on the President's travel restrictions for much of mainland Europe, in a bid to stop people from bringing the Coronavirus into the U.S.
"It was pretty compelling that we needed to turn off the source from that region," said Dr. Anthony Fauci, the head of the National Institute of Allergy and Infectious Diseases.
"We found that 70 percent of new infections in the world were coming from Europe," Fauci said, specifically naming Italy, France and Germany as the largest clusters.
"Europe is the new China," said Centers for Disease Control Chief Dr. Robert Redfield, referring to the big jump in European virus numbers. "And that's why the President made those statements."
"This is not business as usual," Fauci added, as he told lawmakers that additional restrictions could be slapped on travel to and from other countries as well.
Fauci and the CDC chief said the major outbreaks currently in the world for the Coronavirus are in Iran, South Korea, and mainland Europe.
While the two day hearing with health experts drew praise from members of both parties, there were some Republicans who were highly critical.
"Given the nature of this challenge and the President's announcements last night, with all due respect Madam Chair, I believe this hearing should have been canceled or postponed," said Rep. Clay Higgins (R-LA). "These gentlemen should be able to go and do their work."
"I agree with Congressman Higgins that you all need to be on the front lines," Rep. Ralph Norman (R-SC) told Fauci and others on the panel.
But lawmakers in both parties publicly disagreed with Higgins, making the case that public questions and answers with top health care experts had allowed Americans to hear direct testimony about the Coronavirus.
"I think it's important that we hear this because you've got 435 members of Congress who must go home and explain to our constituents what's going on," said Rep. Chip Roy (R-TX).
"You have truly performed an incredible public service," said Rep. Carolyn Maloney (D-NY), the head of the Oversight panel.