This is the first time the Intelligence Committee has used its subpoena power since the joint inquiry into the terrorist attacks of September 11, 2001, and it's the first time it has subpoenaed documents since the 1970s, a Senate historian told NBC News.
The statements from Yates, an Obama administration holdover, offered by far the most detailed account of the chain of events that led to Flynn's ouster as national security adviser in the first weeks of the Trump administration.
Shortly before leaving office, former President Barack Obama imposed additional sanctions on Russian Federation after receiving information from the intelligence community suggesting the country tried to sabotage Democratic presidential nominee Hillary Clinton's campaign.
It will be McCabe's first public appearance since Trump fired Director James Comey, calling into question the future of the the FBI's own investigation into possible collusion between Russian Federation and Trump campaign associates.
Chairman Sen. Richard Burr, R-North Carolina, and Vice Chairman Sen.
According to CNN, Flynn's lawyer, the Alexandria Attorney's Office, the Justice Department and the Federal Bureau of Investigation declined to comment on the latest revelations.
"I've said from the beginning that our intentions are to get information from all the individuals of interest, and I will go to whatever lengths I feel necessary", Burr said in a brief hallway interview at the Capitol, hours before Trump fired Comey Tuesday.
Mr Flynn, a retired general who advised Donald's Trump's election campaign, was sacked in February after it emerged he concealed the nature of his contact with Russia's United States ambassador, Sergei Kislyak, ahead of Trump's inauguration.
"No reasonable person, who has the benefit of advice from counsel, would submit to questioning in such a highly politicized, witch hunt environment without assurances against unfair prosecution", the statement read.
Flynn is also under investigation for business dealings he had with clients tied to foreign governments.
In December 2015, Flynn was paid $45,000 to speak at an event hosted in Moscow by the Kremlin-backed network RT, during which he was seated with Russian President Vladimir Putin.
On Wednesday, The Associated Press reported that Flynn is at odds with his former Turkish client over two unusual payments totaling $80,000 that Flynn's firm sent back previous year to the client. But Turkish businessman Ekim Alptekin has told the AP that the payments from Flynn's firm were refunds for unperformed lobbying.
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