Burr told reporters Thursday about the response from Flynn's lawyer.
Burr noted later Thursday, though, that it's possible Flynn has not yet definitively decided whether he will comply with the subpoena or not.
The Senate Intelligence Committee's counterterrorism probe took on added significance after President Donald Trump dismissed FBI Director James Comey last week amid allegations of Russian meddling in the 2016 USA presidential election.
Former acting attorney general Sally Yates, a Barack Obama appointee held over for the start of the new administration but fired by Trump, said under oath this month that she warned the White House that Flynn had been interviewed by the Federal Bureau of Investigation and that he could potentially be blackmailed by Russians over his misleading claims.
Sweden drops Assange investigation, United Kingdom police says he still faces arrest
Mr Assange faces extradition to the United States for questioning over the activities of WikiLeaks if he leaves the embassy. The Swedish prosecutor is dropping its investigation into an allegation of rape against Wikileaks founder Julian Assange.
The senators also want details on any financial assets or real estate holding tied to Russia and a broader list of meetings between any Trump campaign aides and Russians. Flynn's attorneys had said in the past that he might not turn over requested documents.
That same day, Flynn told friends, "I just got a message from the president to stay strong", Yahoo News reports.
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 have been exposed to questioning from investigators about any personal documents he gave up.
The letters asked for the men to list any meetings they might have had with Russian officials between June 16, 2015 - the day Trump formally launched his presidential campaign - and Trump's inauguration on January 20, as well as records of any communications during that period.
Government claims NHS followed "pretty good" procedure on cyber-attack
On Monday morning before the BBC interview he was accosted by reporters outside his home, but he cycled away without a reply. Some patients have had their appointments cancelled or have been unable to schedule a new appointment.
The existence of the investigation was first confirmed by CNN, which reported that federal prosecutors recently sent grand jury subpoenas to Flynn associates and contractors who worked with his firm. Weeks after his departure, Flynn acknowledged that he had been on the payroll of the Turkish government while serving as a top surrogate and adviser to Trump's campaign - even as the GOP standard-bearer accused his rival of making "pay-to-play" arrangements with foreign governments.
A report by the New York Times claims the Trump administration knew in January 2017 of adviser Michael Flynn's contact with Russian diplomats. Fl... Trump later deleted and retweeted that statement to correct the spelling of "counsel".
Burr says he would welcome Flynn's willingness to cooperate.
Sen. Lindsey Graham (R-S.C.) said he wasn't particularly surprised that Flynn wouldn't cooperate, noting that if he's under criminal investigation, Flynn might not be able to comply with what Congress wants. RT has been branded a propaganda outlet by USA intelligence officials. And our promise to you is that we will always strive to provide indispensable journalism to our community.
Mylan's (MYL) "Sector Perform" Rating Reiterated at Royal Bank of Canada
Mylan comprises approximately 2.7% of Grisanti Capital Management LLC's holdings, making the stock its 17th largest position. Stock exchanged hands with the total volume of 4.54 Million shares, as contrast to its average volume of 5.18 Million shares.
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