The New York Times reports Sessions was interviewed for several hours as part of Mueller's broader Russian Federation probe and whether President Donald Trump has obstructed justice since taking office last January.
The interview, a major development in Mueller's investigation, took place last Wednesday.
Sessions, who like Trump has repeatedly downplayed the idea that Russian meddling helped Trump get elected, was the first known member of the president's cabinet to face questioning by Justice Department Special Counsel Robert Mueller's investigators.
The interview comes as Mueller is investigating whether President Donald Trump's actions in office, including the firing of FBI Director James Comey, constitute efforts to obstruct an FBI probe into contacts between his 2016 campaign and Russian Federation.
Like the President, Mr Sessions has repeatedly downplayed the notion that meddling from Russian Federation helped get Mr Trump elected.
Also, Axios reports this morning: "Attorney General Jeff Sessions - at the public urging of President Donald Trump - has been pressuring FBI Director Christopher Wray to fire Deputy Director Andrew McCabe, but Wray threatened to resign if McCabe was removed, according to three sources with direct knowledge...."
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The probe is also examining whether the President's actions since taking office, such as firing Federal Bureau of Investigation director James Comey, were an obstruction of justice.
In March, Sessions recused himself from anything to do with investigations involving the 2016 election, a move that meant he had no power to influence Mueller's probe.
Sessions has refused himself from the Russian Federation investigation, in part because of his his meetings with Kislyak, which did not immediately disclose during his confirmation hearing a year ago.
Comey's abrupt dismissal caught many off guard, including the former director.
Trump fired Comey on May 9, citing recommendations from Sessions and Rosenstein.
Attorney General Jeff Sessions was questioned by special counsel Robert Mueller in the investigation in to Russian meddling in the USA election.