Now Sessions will take the same stage.
Lawmakers for weeks have demanded answers from Sessions, particularly about meetings he had last summer and fall with the Russian ambassador to the United States.
And then an ally of President Donald Trump suggested the President is thinking about firing the special counsel investigating the Russian Federation issue.
These are the most obvious questions - and frankly the reason Sessions finds himself in hot water.
What questions is Sessions likely to be asked? In March, Sessions recused himself from any investigation into whether Russia meddled in the election after his meetings with Russian officials were disclosed.
Lawmakers, including Al Franken of Minnesota and Patrick Leahy of Vermont, have asked the FBI to investigate and to determine whether Sessions committed perjury when he denied having had meetings with Russians.
Sessions will face questions about his dealings with Russian officials and whether he intentionally misled Congress as a Senate panel investigates alleged Russian meddling in the 2016 US presidential election. We are not here to praise or decry the current NY theatrical production.
The former Republican US senator from Alabama, one of Trump's most avid supporters on the campaign trail, will likely have to explain why he told lawmakers in January he had no dealings with Kremlin officials a year ago.
What was Comey referring to last week about Sessions? Sessions was clear he signed on to Deputy Attorney General Rod Rosenstein's recommendation for firing Comey because it was based on Comey's handling of the Hillary Clinton emails, Comey's decision to go public with an ongoing investigation and Comey's usurpation of the prosecutorial arm of the Justice Department by saying there was no basis for criminal charges against Clinton.
Whatever they are, they're "facts that I can't discuss in an open setting", Comey said. He added that "if there were good cause, I would consider it".
"There are many unanswered and troubling questions, so the attorney general needs to be forthcoming", said Senate Minority Leader Charles Schumer, D-N.Y.
White House spokesman Sean Spicer declined to discuss Trump's "private conversations" with Sessions about Comey, and he left open the possibility that the administration may ask the attorney general to invoke executive privilege regarding them. And Sessions has sat through enough hearings to know his answers will come back to bite him if there is even an element of untruth.
Even the standard process itself of invoking executive privilege could be jumbled by the Russian Federation probe.
Sessions on Saturday said he would appear before the intelligence committee, which has been doing its own investigation into Russian contacts with the Trump campaign.
It's the biggest blockbuster Washington drama since. last week.
Tuesday's hearing may also throw new light on the awkward state of the relationship between Trump and Sessions.
Sessions and Trump have been close allies for more than a year now - Sessions was Trump's earliest supporter in the Senate and his top staff became some of Trump's most important advisers.
Comey himself had a riveting appearance before the same Senate panel last week, with some key moments centered on Sessions.
That's why the reports last week that Sessions offered to resign over a new, incredible strain between the two, was pretty surprising.
Sessions heads to Capitol Hill in a perilous position with his boss, with U.S. media reporting Trump has grown displeased with his attorney general, notably for his recusal on the Russian Federation probe.
Sessions certainly isn't expected to hit his boss while testifying on live television, but look for senators to try and get at how much pressure Trump has put on him.
"The Senate and the American people deserve to know exactly what involvement with the Russian Federation investigation he had before his recusal, what safeguards are in place to prevent his meddling, and why he felt it was appropriate to recommend the firing of Director Comey when he was leading that investigation", said Sen. However, since then, he has acknowledged meeting with Russia's ambassador to the U.S., Sergey Kislyak, in 2016.