WASHINGTON — A day after Attorney General Jeff Sessions said he would testify this week before the Senate Intelligence Committee, Democratic senators on Sunday urged the panel to question him about the Trump campaign’s ties to Russia in a public hearing, rather than behind closed doors.

It was unclear on Sunday whether the committee planned to question the attorney general on Tuesday in an open or closed session. Either way, senators said he would face pointed questions not only about his contacts with Russian officials, but also about his conversations with James B. Comey, the ousted F.B.I. director.

Members of the Intelligence Committee said they wanted Mr. Sessions to recount what happened during and after the Feb. 14 Oval Office meeting where, according to Mr. Comey, President Trump pressured him to drop the F.B.I. investigation into Michael T. Flynn, the former national security adviser. Mr. Sessions was among those Mr. Trump asked to leave the meeting so he could speak privately with Mr. Comey.

“We’ve had a lot of unnamed sources in the media come out and make statements about Jeff Sessions,” Senator James Lankford of Oklahoma, a Republican who is on the committee, said on CBS’s “Face the Nation.” “It’d be very good to get it directly from him.”