Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) called for an immediate “inquiry into Russia" following the resignation of national security adviser Michael Flynn.

In a series of tweets Tuesday morning, Warren demanded “a real, bipartisan, transparent inquiry into Russia” and questioned the Trump administration’s role in Flynn’s communications with Moscow.

“Congress must pull its head out of the sand and launch a real, bipartisan, transparent inquiry into Russia. Our [national] security is at stake,” Warren said in one of several tweets.

Congress must pull its head out of the sand and launch a real, bipartisan, transparent inquiry into Russia. Our natl security is at stake. — Elizabeth Warren (@SenWarren) February 14, 2017

She also questioned President Trump’s knowledge of the situation.

“This. Is. Not. Normal. @realDonaldTrump owes Americans a full account of his Admin’s dealing with Russia, both before & after the election,” she tweeted.

This. Is. Not. Normal. @realDonaldTrump owes Americans a full account of his Admin’s dealings with Russia, both before & after the election. — Elizabeth Warren (@SenWarren) February 14, 2017

“When did @WhiteHouse know that Flynn lied? What other contacts with Russia occurred during the campaign? Who knew what? Who approved what?” she added.

When did @WhiteHouse know that Flynn lied? What other contacts with Russia occurred during the campaign? Who knew what? Who approved what? — Elizabeth Warren (@SenWarren) February 14, 2017

She also claimed Flynn could be a "scapegoat" for the Trump administration's relationship to Russia.

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“Michael Flynn’s blinding hatred & shady Russian ties disqualified him as NSA on day one. His removal is a win for American values,” she tweeted, before adding that Flynn must not become a “scapegoat."

Michael Flynn’s blinding religious hatred & shady Russian ties disqualified him as NSA on day one. His removal is a win for American values. — Elizabeth Warren (@SenWarren) February 14, 2017

Flynn resigned from his position late Monday after reports surfaced that he misled senior White House officials — including Vice President Pence — about his communications with Russia. He reportedly discussed Obama-era sanctions against Moscow with the ambassador to Russia before Trump was sworn into office.

Warren joins a host of Democrats in using Flynn’s resignation as fuel for an investigation into the Trump administration’s ties to Russia.

On Tuesday, House Oversight Committee Chairman Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) said his panel will not investigate the events that led to Flynn’s resignation.

Additionally, House Intelligence Committee Chairman David Nunes (R-Calif.) said he won’t investigate Flynn, but will investigate the leaks that resulted in Flynn’s resignation.