Senators vented their frustration to senior administration officials during a closed-door briefing Thursday morning over what lawmakers complain is a persistent shortage of coronavirus testing kits across the country and unreliable data on how fast the virus is spreading in the United States.

After Vice President Pence told GOP lawmakers at a private lunch meeting earlier in the week that millions of test kits would be made available at the end of the week, senators on Thursday complained to senior officials that the shortage of testing kits remains a major problem.

“There’s frustrations with the testing,” said Sen. Shelley Moore Capito Shelley Wellons Moore CapitoSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (R-W.Va.), the chairwoman of the Senate Appropriations Subcommittee on Homeland Security, as she left the meeting.

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She said lawmakers also expressed frustration over the “accuracy” of the data on “people infected” around the country.

Capito said she and colleagues are frustrated the testing “is just not widespread enough” and “not comprehensive enough.”

“What do you tell your constituents? That’s where we are,” she said.

Senior administration officials warned senators that it will be difficult to distribute enough testing kits because of supply chain problems, highlighting the fact that the kits are primarily manufactured overseas.

“We are going to have — and I suspect are having, and I think they alluded to it in there — a supply chain problem,” said Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.).

“We’re going to have supply chain problems for two reasons. The first is these things are primarily made outside the United States and either those supplies are being disrupted by factory shutdowns, like in China, or the countries who make them are hoarding them, like India or South Korea,” he said.

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“I believe that’s going to be an issue that is impeding faster deployment of these tests,” Rubio added.

Senators attended the nearly hourlong briefing in the Senate Health, Education, Labor and Pensions Committee room with several senior administration officials, including Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, and Dr. Robert Redfield, the director of the Centers for Disease Control and Prevention.

Ken Cuccinelli, the acting director of U.S. Citizenship and Immigration Services, also attended.

Rubio said his colleagues are frustrated over a lack of concrete information on the extent of infections in the United States.

“I think people are frustrated,” he said. “We all want a date. We all want to be told by Friday there will be 10 million tests available. The problem is they can’t tell us that.”

Senators are on high alert after a staffer in Sen. Maria Cantwell Maria Elaine CantwellHillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes Bipartisan senators call for investigation of popular fertility app The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans MORE’s (D-Wash.) tested positive Wednesday for the coronavirus.

Cantwell has closed her Washington, D.C., office for the rest of the week for deep cleaning.

Sen. Joe Manchin Joseph (Joe) ManchinBiden promises Democratic senators help in battleground states Senate leaders quash talk of rank-and-file COVID-19 deal OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (D-W.Va.), who said his staff was in contact with Cantwell’s staff, said he will ask his aides to telecommute on Friday.

“We’re concerned about it. I think anyone who feels who needs to be tested should be tested immediately,” he said.

“We’re going to try tomorrow, we’re going to try telecommut[ing]” he added. “We’re going to see how that works tomorrow so we don’t put any of our employees in danger.”

Yet, Manchin said “we should do everything we can to make sure we keep this government working.”

“We should not shut the government down in any way, shape or form,” he added.

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Sen. Mitt Romney Willard (Mitt) Mitt RomneySenate Republicans face tough decision on replacing Ginsburg McConnell says Trump nominee to replace Ginsburg will get Senate vote GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Utah) also told reporters that he will ask his staff to begin teleworking.

Sen. Mike Braun Michael BraunPessimism grows as hopes fade for coronavirus deal McConnell shores up GOP support for coronavirus package Patient Protection Pledge offers price transparency MORE (R-Ind.) said he will continue his regular D.C. operations but is asking staff to be on alert for symptoms of coronavirus and to self-quarantine themselves immediately if they feel sick.

“I think any one individual should treat this with everything we’ve learned about it. If you show symptoms, isolate yourself. Do all the things that we’ve been hearing about. I’m washing my hands a lot more,” Braun said.

But some Senate staff have expressed concern about coming to work in the weeks ahead while the extent of the virus’s spread remains largely unknown.

“The Senate building is like a giant cruise ship with people coming in here from off the street,” said one concerned staffer.

Congressional leaders announced Thursday morning that the Capitol and the Senate and House office buildings will be closed to the public until April 1 because of the coronavirus but that official business will continue.