Democrats responded swiftly after national security adviser Michael Flynn resigned amid controversy around his communication with Russia’s ambassador to the U.S.

Flynn’s status in the Trump administration had been in question after reports that he had talked about sanctions with the Russian ambassador prior to President Trump’s inauguration.

Earlier Monday night, The Washington Post reported that the Justice Department and former acting Attorney General Sally Yates had warned the Trump administration that Flynn’s communications with Russia could open him up to blackmail.

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Sen. Chris Murphy Christopher (Chris) Scott MurphyGOP chairman to release interim report on Biden probe 'in about a week' This week: House returns for pre-election sprint Battle over timing complicates Democratic shutdown strategy MORE (D-Conn.), a member of the Senate Foreign Relations Committee, urged the Trump administration to find an “experienced replacement” for Flynn.

Flynn's departure only matters if 1) he's followed by a mainstream, experienced replacement, 2) we get to bottom of the Trump/Russia story. — Chris Murphy (@ChrisMurphyCT) February 14, 2017

The White House named retired Army Lt. Gen. Keith Kellogg as acting national security adviser following Flynn’s resignation.

“General Flynn is doing the right thing by stepping down. However, far too many questions remain unanswered about this Administration's ties to Russia," Rep. Eliot Engel (D-N.Y.), the ranking member of the House Foreign Affairs Committee, said in a statement.

"We need a thorough, bipartisan investigation to get the complete picture of Russia's interference in our election, and Congress needs to take steps, such as passing my SECURE Our Democracy Act, to punish those responsible.”

Rep. Brendan Boyle (D-Pa.) echoed that call in a tweet, calling on members of both parties to ask for a congressional investigation into possible Russian ties in the Trump administration.

Tomorrow all members of Congress, both D and R, should unite to call for congressional investigation into Trump/Russia ties. — Brendan Boyle (@RepBrendanBoyle) February 14, 2017

Rep. Steve Cohen (D-Tenn.) was one of the first Democrats out the gate with reaction, saying Flynn was a “poor choice predicted to end badly” and a “selection by [an] amateur.”

First resignation!A poor choice predicted to end badly,said my former CIA pal weeks ago.Flynn's selection by amateur #potus.Whats next? https://t.co/nA9kF2fGiY — Steve Cohen (@RepCohen) February 14, 2017

Rep. Jamie Raskin (D-Md.) called Flynn’s resignation a “good 1st step," while Rep. Joaquin Castro (D-Texas) said it was a “step in the right direction.”

General Flynn's resignation is a step in the right direction. But many questions remain. — Joaquin Castro (@JoaquinCastrotx) February 14, 2017

Flynn's resignation is a good 1st step. If colluding w/Russia on sanctions is unacceptable, what about colluding w/Russia on the campaign? https://t.co/4oscQGClEX — Rep. Jamie Raskin (@RepRaskin) February 14, 2017

Rep. Seth Moulton (D-Mass.) said Flynn’s departure “might actually improve our national security.”

This seems to be the first thing the Trump Administration has done that might actually improve our national security. https://t.co/2UsUvCrbzY — Seth Moulton (@sethmoulton) February 14, 2017

Former Rep. John Dingell (D-Mich.) reacted on Twitter, saying the resignation can’t be the end of the story.

Flynn's resignation CANNOT be end of the story.



Who talked to who? When?



Who knew? When?



How far up did it go?



How much of dossier true? — John Dingell (@JohnDingell) February 14, 2017

Rep. Eric Swalwell (D-Calif.) echoed Dingell in a statement sent late Monday, saying that Flynn's resignation is not "the end of the story."

Swalwell led an effort earlier in the day, in which dozens of Democratic lawmakers signed a letter that they planned to send on Tuesday urging the Trump administration to suspend Flynn.

“Michael Flynn is only resigning because he got caught by the press for improper prior and existing relationships with Russia," Swallwell said in the statement. "More than 100 Members of Congress who signed my letter urging his suspension knew that he had to go, but we also knew this isn’t the end of the story."

"Questions remain about whether he made such contact of his own volition or on orders; whether Trump administration officials were misled about the contact or lied to cover it up; and whether Flynn might’ve been susceptible to Russian blackmail, as the Justice Department reportedly informed the White House late last month."