U.S. Attorney General Jeff Sessions met behind closed doors on Thursday with members of the House of Representatives Intelligence Committee as it investigates possible Russian efforts to influence the 2016 U.S. presidential election.
He was expected to spend at least two hours in the interview.
The panel is among several congressional committees, along with the Justice Department's special counsel Robert Mueller, investigating alleged Russian interference in the campaign and potential collusion by President Donald Trump's campaign.
Moscow has denied any meddling and Trump has said there was no collusion.
When he was a Republican U.S. senator, Sessions was an early supporter and close adviser to Trump during his run for the White House.
Later on Thursday, the intelligence committee said it was meeting with Erik Prince, who founded the private military contractor Blackwater and also was a supporter of Trump's presidential campaign.
(Reporting by Sarah N. Lynch and Patricia Zengerle; Editing by Bill Trott)