Two Democratic senators asked then-FBI Director James Comey to investigate Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE amid concerns about his "lack of candor" regarding conversations with Russian Ambassador Sergey Kislyak.

"We are concerned about Attorney General Sessions' lack of candor to the committee and his failure thus far to accept responsibility for testimony that could be construed as perjury," Sens. Patrick Leahy Patrick Joseph LeahyBipartisan representatives demand answers on expired surveillance programs Democrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy MORE (Vt.) and Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (Minn.) wrote in a letter to the former FBI director.

Franken and Leahy, both members of the Judiciary Committee, sent letters to Comey on March 20 and April 28, and followed up with another to acting FBI Director Andrew McCabe on May 12.

Sessions was grilled by the two senators during his confirmation hearings about his contacts with Russian officials.

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"Earlier this year, Attorney General Sessions provided false testimony before the Senate Judiciary Committee in response to our questions regarding his contacts with Russian officials," Franken and Leahy said in a Thursday statement.

"The attorney general never fully explained or even acknowledged the misrepresentations in his testimony, and we remained concerned that he had still not been forthcoming about the extent of his contacts with Russian officials."

The two senators said Sessions should resign as attorney general if he lied about the meeting.

"We served with the attorney general in the Senate and on the Judiciary Committee for many years," they continued in the statement. "We know he would not tolerate dishonesty if he were in our shoes. If it is determined that the attorney general still has not been truthful with Congress and the American people about his contacts with Russian officials during the campaign, he needs to resign."

The statement comes a day after CNN reported that congressional investigators were looking into whether Sessions had met with Kislyak for a third, previously unreported, time.

The Trump administration is dealing with a series of revelations surrounding the FBI probe into potential ties between the Trump campaign and the Kremlin.

Sessions, a top Trump surrogate during the campaign, was forced to recuse himself from the probe after The Washington Post reported that he met with Kislyak during the campaign.