Food and Drug Administration (FDA) Commissioner Stephen Hahn said Sunday that the U.S. needs to do more coronavirus testing, adding there’s “no question about that.”

ABC’s “This Week” co-host Martha Raddatz asked Hahn why the U.S. is “still so far behind” other countries like the U.K., Germany and South Korea, who have tested millions of residents.

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Hahn responded calling the situation “complicated” and “rapidly moving,” noting the pressure on supply chains. He said the commission has heard from people “on the ground” that in “some areas it’s very easy to get a test and in other areas, not.”

He noted White House coronavirus task force members Anthony Fauci Anthony FauciOvernight Health Care: CDC reverses controversial testing guidance | Billions more could be needed for vaccine distribution | Study examines danger of in-flight COVID-19 transmission Trump claims enough COVID-19 vaccines will be ready for every American by April Gates says travel ban made COVID-19 worse in US MORE and Deborah Birx said Friday that the U.S. has conducted more than 2 million coronavirus tests, which he said was more than any other country.

“Now we need to do more, no question about that,” he said.

Pressed on why the U.S. is still "far behind" other countries in COVID-19 testing, FDA Commissioner Hahn tells @martharaddatz in “some areas it’s very easy to get a test” and in others it’s not.



“We need to do more, no question about that,” he adds. https://t.co/37q29hM48A pic.twitter.com/3LQrsvoNcR — This Week (@ThisWeekABC) April 12, 2020

The FDA has authorized one antibody test, that will determine whether a person has already had the virus, he said. But he said this form of testing, which is “one of the keys” of getting the country restarted, should be expected “relatively soon,” with an exact date depending on the data.

Raddatz also pressed Hahn on how Americans could potentially return to work without a nationwide testing system. The commissioner cited the geographic location, the number of tests and the number of infections as factors that will influence how testing is distributed.

“And yes, further ramping up testing both diagnostic as well as the antibody test will really be necessary as we move beyond May and into the summer months and then into the fall.”

.@MarthaRaddatz: “How can Americans safely return to work without a nationwide testing system?”



FDA Commissioner Stephen Hahn: “Further ramping up testing...will really be necessary as we move beyond May and into the summer months and then into the fall.” https://t.co/37q29hM48A pic.twitter.com/XryBwrqREX — This Week (@ThisWeekABC) April 12, 2020

President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE originally suggested an Easter Sunday reopening date for the government but backtracked saying social distancing practices would continue through the end of April.

Critics have condemned the administration for a lack of available testing across the country, saying it inhibits the federal response to COVID-19.

The U.S. has confirmed more than 530,000 cases and at least 20,608 deaths from COVID-19, according to data from Johns Hopkins University.