"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.

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.

"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.