The leaders of the Senate Intelligence Committee on Monday said they will "vigorously pursue" the testimony of former national security adviser Michael Flynn after he declined to comply with their subpoena.

"We will vigorously pursue General Flynn’s testimony and his production of any and all pertinent materials pursuant to the Committee’s authorities," Committee Chairman Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) and ranking Democrat Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (Va.) said in a joint statement.

Lawyers for Flynn said in a letter that he would not comply with the subpoena for information and documents as part of the committee's investigation into Russia's election interference.

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"General Flynn is entitled to, and does, invoke his Fifth Amendment privilege against production of documents," they wrote in the letter.

Burr and Warner added that "while we recognize General Flynn’s constitutional right to invoke the Fifth Amendment, we are disappointed he has chosen to disregard the Committee’s subpoena."

Neither Burr nor Warner has said if they will try to hold Flynn in contempt for refusing to comply with their subpoena.

"We're going to keep all the options on the table. I think we'll be looking into the question of whether he can make a blanket Fifth Amendment [claim]," Warner told reporters separately on Monday.

Pressed if he would push for a contempt of Congress vote, Burr added, "I think there's another step to take. ... Stay tuned."

Several members of the Senate Intelligence Committee, including Sen. John Cornyn John CornynAirline job cuts loom in battleground states Senate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (R-Texas), have signaled they don't think lawmakers can force Flynn to testify if he is invoking the Fifth Amendment.