Richard Burr, announced that Flynn would not be complying with the Senate's subpoena - although he later walked that back by saying that he'd not yet gotten a "definitive answer" from Flynn's lawyer.
Congressional aides told Reuters the committee was still negotiating in the hopes of obtaining the requested documents.
Update 5/18/17 1:55 pm: The Associated Press has now reported a correction of an earlier story, after a Senate Committee clarified that they had not received a response from Michael Flynn's legal team.
As national security adviser, Flynn held several phone calls with Russian ambassador Sergey Kislyak before Trump's inauguration and immediately after.
US Launches First Direct Strike on Pro-Regime Troops in Syria
A US defence official said the convoy had not responded to numerous warnings that it was "getting too close to coalition forces". Pro-Assad outlets reported that the us -led coalition hit the Iranian-backed Imam Ali brigade.
While Flynn was asked to resign by President Donald Trump in February after former Acting Attorney General Sally Yates warned the White House that Russian Federation had leverage over him, Flynn was also the center of several major stories that broke on Wednesday and Thursday morning.
The communications had been intercepted by the USA intelligence community because they involved Russian officials, who are routinely monitored for national security concerns. The subpoena reportedly covers a "large number of documents" relating to "his interactions with Russian officials".
Last month, the top Democratic and Republican members of the House Oversight Committee announced that Trump's failure to disclose the payments he received from foreign governments likely constituted a violation of US law.
Nina Ginsberg, a veteran Washington defense attorney with extensive experience in national security cases, said that without an ironclad immunity deal from the committee, Flynn would be exposed to questioning from investigators about any personal documents he gave up.
Russian Federation calls US-led strike on Assad regime 'unlawful'
A US defence official said the convoy had not responded to numerous warnings that it was "getting too close to coalition forces". The convoy was hit on Thursday as it neared a group of US-backed rebels and a Western special forces unit in Tanf.
Amid Justice interest, Trump formally chose Flynn as his national security adviser. When Flynn declined to do so, the panel issued a subpoena on May 10, according to the AP.
"The criminal contempt process takes forever - you vote [for] it and then it goes to the US attorney and he has to decide what to do with it", senior counsel Stanley Brand of the Akin Gump firm told Politico. "No matter what option they take, it's not quick".
Man Utd fans react to Spurs defeat outside White Hart Lane
I think I am very lucky guy because to share the history of such a club in that special moment is so lucky to be here. Tottenham will play at Wembley next season as work continues on their new 62,000-seat stadium next to the old ground.