U.S. Attorney General Jeff Sessions testifies before the House Judiciary Committee.

USA TODAY will stream this event live in the player above.

Sessions could not have been more definitive when he told a Senate panel last month that he had no knowledge of Trump campaign contacts with Russia.

“I did not, and I’m not aware of anyone else that did,” Sessions told the Senate Judiciary Committee. “I don’t believe that happened.”

Democrats and Republicans on the House Judiciary Committee are preparing a strong challenge to Sessions’ assertions at a hearing Tuesday, based largely on the guilty plea of George Papadopoulos, who served as a foreign policy adviser to the Trump campaign and admitted to the FBI he attended a national security meeting in March 2016 with then-candidate Donald Trump, Sessions and other advisers.