The American Civil Liberties Union (ACLU) is calling for Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE to be investigated for perjury.

“Jeff Sessions took an oath before the Senate Judiciary Committee to tell the truth, the whole truth and nothing but the truth, and it is now clear that he broke that oath in his confirmation hearing,” Anthony D. Romero, the ACLU’s executive director, said in a statement Thursday. "This matter must not and cannot be seen as a partisan issue, as it goes to the heart of the credibility of our democracy."

“The American people deserve a full investigation into whether Sessions perjured himself and if he is indeed fit to serve as our nation’s highest law enforcement official. No one is above the law, certainly not those sworn to uphold it.”

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Reports emerged late Wednesday that Sessions spoke twice with Russian Ambassador Sergey Kislyak during the 2016 presidential campaign.

Sessions did not disclose speaking with Kislyak during his confirmation hearings for attorney general, testifying under oath that he “did not have communications with the Russians" as a surrogate for now-President Trump.

The former GOP senator from Alabama reportedly first spoke with Kislyak in July during a Heritage Foundation event.

Sessions then purportedly spoke with Kislyak via phone in September, a time when U.S. intelligence officials believe Russia was interfering in the White House race ultimately won by Trump.

Reports emerged last month that top aides and allies from Trump’s campaign were in recurring contact with senior Russian intelligence officials.

Sessions said early Thursday that he is willing to recuse himself from a federal probe of involvement in Trump’s bid if necessary.

“I have said whenever it’s appropriate, I will recuse myself,” he told NBC News. "There’s no doubt about that.”

“Well, I have not met with any Russians at any time to discuss any political campaigns,” Sessions added of reports about his talks with Kislyak. "Those remarks are unbelievable to me and are false. I don’t have anything else to say about that.”

Democrats have seized on the allegations, with some, including Senate Minority Leader Charles Schumer Chuck SchumerOvernight Health Care: Schumer calls for Azar to resign over 'chaos' in coronavirus response CNBC's Cramer calls Pelosi 'crazy Nancy' in live interview Schumer calls for Azar to resign over 'chaos' in coronavirus response MORE (D-N.Y.), calling for Sessions’s resignation.