Sen. 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 (D-Va.) on Sunday said he wants to hear from former national security advisor Michael Flynn as part of the probe into Russia’s potential ties to Trump campaign officials.

“I want to hear from General Flynn,” Warner told CBS’s “Face the Nation.”

Flynn resigned from his post in the White House last month following a report that he misled Vice President Mike Pence Michael (Mike) Richard PenceGOP short of votes on Trump's controversial Fed pick Pence seeks to boost Daines in critical Montana Senate race The Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy MORE regarding a conversation he had with Russia’s ambassador to the United States, Sergey Kislyak.

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Warner, who serves as the vice chairman of the Senate Intelligence Committee, also emphasized the seriousness of President Trump’s recent accusation that former President Barack Obama Barack Hussein ObamaGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high D-Day for Trump: September 29 Obama says making a voting plan is part of 'how to quarantine successfully' MORE wiretapped Trump Tower. Warner called Trump’s claims “very reckless,” but emphasized that the committee will work to get to the bottom of the accusations.

Obama through a spokesperson denied that he ordered any wiretapping of Trump Tower.

"A cardinal rule of the Obama Administration was that no White House official ever interfered with any independent investigation led by the Department of Justice," Kevin Lewis said in a statement.

"As part of that practice, neither President Obama nor any White House official ever ordered surveillance on any U.S. citizen," Lewis added. "Any suggestion otherwise is simply false."

Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), who also sits on the intelligence committee with Warner, called for an investigation into the accusations during her own appearance on the Sunday show.

“What we need to deal with is evidence, not statements. At this point, I’ve seen no evidence of what he alleges,” Collins said of the president’s wiretapping claims.