He recused himself in March from a federal investigation into contacts between Russian Federation and Donald Trump's presidential campaign after acknowledging that he had met twice past year with the ambassador.
Sessions' appearance before the intelligence committee is an indication of just how much the Russian Federation investigation has shaded his tenure.
Here's why Sessions is at the center of so much, and here's how he can help us better understand the still-unraveling Trump-Russia-FBI investigation.
That remark came after revelations emerged that Sessions had met with Russia's ambassador to the US last year, despite testifying under oath during a confirmation hearing that he "did not have communications with the Russians".
A day after The Washington Post reported that, Sessions recused himself from the Russian Federation investigation.
The attorney general was forced to recuse himself in March from the federal investigation into Russian interference in the US election after media reports that he twice met with Kislyak during the 2016 campaign and did not disclose that to the Senate during his confirmation hearing in January.
These are the most obvious questions - and frankly the reason Sessions finds himself in hot water. Did he get the feeling Russians were trying to recruit him or others for anything?
There is no doubt senators on the committee have been preparing for his testimony, but here are the questions to Sessions that will be critical in determining his fate.
Trump says '100 percent' ready to testify under oath
Trump's tweet read: "Despite so many false statements and lies, total and complete vindication . and WOW, Comey is a leaker". His tweet aside, Trump did not mention the Russian Federation probe during an infrastructure speech Friday at the U.S.
On Wednesday, written testimony by Comey about his interactions with President Trump was released in which the ex-director noted that he asked Sessions "prevent any future direct communication" between Trump and himself after the two shared a private dinner on January 27 and one-on-one Oval Office meeting on February 14 that Comey found to be "inappropriate".
During Comey's appearance Thursday before the Senate Intelligence Committee, Sen.
Comey later told Sessions he didn't want to be alone with the president.
Comey said Sessions responded with, essentially, a shrug.
"I opposed Sessions for being Attorney General of the United States". Also, why did Comey feel he couldn't trust Sessions?
JOHNSON: You know, there's a big question about that right now. Comey declined to elaborate in an open setting. Sessions is especially important to the case because as the attorney general, he was Comey's boss, and because Comey testified "the attorney general lingered by my chair, but the president thanked him and said he wanted to speak only with me".
In addition to the Senate Intelligence Committee's investigation into Russia's role in USA politics, special counsel Robert Mueller is leading an independent inquiry into Russia's meddling and potential links between Russians and the Trump campaign, after being appointed by Deputy Attorney General Rod Rosenstein last month. And he can expect questions about his involvement in Comey's May 9 firing, the circumstances surrounding his decision to recuse himself from the FBI's investigation, and whether any of his actions - such as interviewing candidates for the FBI director position or meeting with Trump about Comey - violated his recusal pledge.