WASHINGTON — In the days since the dramatic congressional testimony last week by James B. Comey, the former F.B.I. director, numerous questions have swirled about the role that Attorney General Jeff Sessions played in Mr. Comey’s firing, as well as how much Mr. Sessions may be enmeshed in the bureau’s Russia investigation.

Senators will have the opportunity to confront Mr. Sessions about these topics on Tuesday, when the attorney general appears before the Senate Intelligence Committee. Members of the committee are expected to press Mr. Sessions about what he did — and did not do — after a private Oval Office meeting in February when President Trump reportedly asked Mr. Comey to end the F.B.I.’s investigation into Michael T. Flynn, the former national security adviser.

Mr. Sessions will almost certainly also be grilled on vague — and unsubstantiated — reports that he had a secret meeting with the Russian ambassador last year at the Mayflower Hotel in Washington. Mr. Sessions is expected to deny that the meeting took place.

Mr. Sessions initially told Congress that he had no contacts with Russian officials last year, but in March he was forced to acknowledge meeting the ambassador, Sergey I. Kislyak, on two occasions. A third meeting could prove devastating for the attorney general, who reportedly has already offered to resign.