Sens. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.), Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) and more than a dozen of their Democratic colleagues sent a letter to Vice President Pence on Tuesday demanding answers over the insufficient availability of coronavirus testing kits.

In the letter, Warren and the other senators questioned why Pence, 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 and Health and Human Services Secretary Alex Azar had made statements proclaiming the availability of tests when in fact many Americans have been unable to get tested at hospitals around the U.S.

"When did key Task Force officials — including Vice President Pence, Secretary Azar, and [Centers for Disease Control and Prevention] CDC Director [Robert] Redfield — become aware of delays in developing the CDC-approved tests?" the letter asks. "What is the explanation for the misinformation provided to the public about the availability of COVID-19 tests by (1) President Trump (2) Secretary Azar, and (3) Vice President Pence?"

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In particular, the senators faulted Trump for his remarks on March 6, when he told reporters that "anybody who wants a test, gets a test."

"The Trump Administration has made a series of false promises about the country’s diagnostic capacities, spreading confusing and untrue information about the availability of tests for the general public," reads the letter.

Warren's letter was co-signed by Sanders, a 2020 presidential candidate, as well as Democratic senators including Tim Kaine Timothy (Tim) Michael KaineBiden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (Va.), Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (Minn.), Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (Wash.) and Sherrod Brown Sherrod Campbell BrownBipartisan praise pours in after Ginsburg's death Emboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (Ohio).

The Trump administration has faced sharp criticism from Democrats over the response to the global coronavirus outbreak as well as his own remarks, which have often been at odds with top health experts in the government.