The Senate's intelligence committee had asked Flynn - President Trump's former national security adviser - in April to turn over documents relevant to the committee's investigation into Trump campaign associates' connections to Russian Federation.
Burr's statement was a complete reversal from his comments earlier on Thursday, when he said that Flynn's lawyers told the committee the retired Army general "would not honor" the subpoena. "Consistent with the Committee's position since the beginning of [our] investigation, I welcome their willingness to cooperate".
A few weeks after reportedly sending a message to Flynn to "stay strong", the former national security adviser has chose to defy a subpoena to testify at a Senate Intelligence Committee hearing.
"We are continuing on with a lot of interviews and through those interviews it leads us to additional document requests and additional individuals we'd like to talk to", Burr said.
Burr's initial announcement prompted many folks on Twitter to say the move meant that Flynn could end up in jail: contempt of Congress! Flynn is also the target of other congressional investigations as well as an ongoing FBI counterintelligence probe and a separate federal investigation in Virginia.
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.
Flynn, a retired Army lieutenant general, was sacked from his position as Trump's national security adviser in February.
For refusing to honor a Congressional committee's subpoena, Michael Flynn could be found in contempt of Congress. That person spoke on the condition of anonymity to discuss confidential details of the committee's investigation.
The committee last week issued a subpoena for documents regarding his interactions with Russian Federation officials.
The Justice Department has appointed former FBI Director Robert Mueller (MUHL'-ur) as a special counsel to lead a federal investigation into allegations that Donald Trump's campaign collaborated with Russian Federation to sway the 2016 election that put him in the White House. Page shared a copy of his letter with the AP.
Finally, the New York Times reported that Trump's administration was aware that Flynn was under investigation for working for Turkey's government, which he did not disclose at the time, and hired him as a national security adviser anyway.