Michael Flynn had been asked at the end of last month to provide the Intelligence Committee with any documents potentially related to the panel's Russia probe. | AP Photo Senate Intelligence Committee subpoenas Flynn 
 
 The Senate Intelligence Committee has subpoenaed any Russia-related documents from former national security adviser Michael Flynn for its continuing probe into the Kremlin's efforts to manipulate the 2016 election. 
 
 The legal order, announced by the panel's bipartisan leaders Sens. Richard Burr (R-N.C.) and Mark Warner (D-Va.), went out Wednesday after Flynn's attorneys informed the panel they would not cooperate with the probe unless the embattled former general was granted immunity, a congressional source told POLITICO. 
 
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 Flynn had been asked, along with a spate of other former and current Trump associates, at the end of last month to provide the Intelligence Committee with any documents potentially related to the panel's Russia probe. The investigation is examining, among other questions, whether Flynn or other Trump associates had improper contact with the Russian government throughout the course of the campaign or the transition period. 
 
 Former Trump advisor Carter Page has also been asked to provide documents to the committee. He, too, has suggested he won't cooperate. Unlike Flynn, though, Page has been engaging directly with the panel frequently via email. Page has not yet been subpoenaed. 
 
 The announcement comes just 24 hours after President Donald Trump fired FBI Director James Comey, who was running a parallel counterintelligence investigation into alleged ties between Trump's associates and the Russian government, sparking immediate bipartisan outrage and accusations that Trump was obstructing the FBI's probe. 
 
 Comey's ouster also leaves the Senate's inquiry without a key ally. Despite criticism of his handling of the Clinton email investigation, Comey was widely seen as an amenable partner in the probe. 
 
 
 
 CORRECTION: Because of an editing error, an earlier version of this story misstated Sen. Mark Warner's party affiliation. ||||| Breaking News Emails Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings. 
 
 May 10, 2017, 11:06 PM GMT / Updated May 11, 2017, 8:13 AM GMT By Phil McCausland 
 
 President Donald Trump's former national security adviser, retired Gen. Michael Flynn, was subpoenaed by the Senate Intelligence Committee on Wednesday. 
 
 The committee, led by Sens. Richard Burr, R-North Carolina, and Mark Warner, D-Virginia, said it requested documents that members believe to be relevant to its investigation into alleged Russian meddling in the 2016 presidential election. 
 
 Michael Flynn arrives to deliver a statement during the daily briefing at the White House in February. Carlos Barria / Reuters file 
 
 The committee initially requested the documents from Flynn in a letter on April 28, but he declined to comply if he wasn't offered immunity. The Intelligence Committee declined the deal and has now followed up with an official subpoena. 
 
 Burr and Warner have said they considered their committee's subpoena power as an available recourse. 
 
 "I think all options are on the table, and I think you can envision what those options are," Burr told reporters on Tuesday, a day ahead of the announcement. 
 
 "I think the most severe would be a subpoena," he said. "I think that the vice chairman and I have, from the beginning, believed that we would make more progress faster with voluntary participation by witnesses, so we have gone to all lengths to exhaust their willingness to do that." 
 
 This is the first time the Intelligence Committee has used its subpoena power since the joint inquiry into the terrorist attacks of Sept. 11, 2001, and it's the first time it has subpoenaed documents since the 1970s, a Senate historian told NBC News. 
 
 Former President Barack Obama cautioned Trump against hiring Flynn as his national security adviser, but Trump ignored the warning. Obama fired Flynn in 2014 as head of the Defense Intelligence Agency. 
 
 Related: Senate GOP Rallies Around Trump, Against Special Prosecutor 
 
 Trump still hired Flynn, but he fired him three weeks after the start of his administration because he misled Vice President Mike Pence about conversations he had with the Russian ambassador to the United States about economic sanctions. 
 
 Former Acting Attorney General Sally Yates testified on Monday that she told the Trump administration that Flynn had been compromised and could be potentially "blackmailed by the Russians."
– The Senate Intelligence Committee stepped up its investigation of alleged Russian meddling in last year's election Wednesday and subpoenaed former national security adviser Michael Flynn. A Senate historian tells NBC News that this is the first time the Intelligence Committee has used its subpoena power since the congressional investigation of the 9/11 attacks. Committee leaders Sen. Richard Burr, a Republican, and Sen. Mark Warner, a Democrat, say the committee asked Flynn for documents they believe are relevant to the investigation of alleged Russian links. A day earlier, Burr described a subpoena as the "most severe" of the options on the table. The committee issued the legal order after Flynn's attorneys said they wouldn't cooperate with the investigation unless he was granted immunity from prosecution, sources tell Politico. Burr and Warner say Flynn was asked to voluntarily turn over the documents April 28 but declined. Former Trump adviser Carter Page has also been asked to provide documents. The subpoena was issued a day after Trump's firing of FBI Director James Comey, a move that Burr said makes the committee's work "a little bit more difficult," but not impossible, the Washington Post reports. "The timing of this and the reasoning for it doesn’t make any sense to me," Burr said of Comey's firing.