More recently, he has served as the attorney for New Jersey Gov. Chris Christie, R, a Trump ally. His strategy was to attack whoever was coming for him in every way possible.
Democratic Senator Mark Warner, minority leader of the Senate Intelligence Committee, was adamant that the Committee press Comey for answers about the possibility of Trump interfering in the FBI's investigation into possible ties between the Trump administration and Russian Federation, as well as possible interference in the 2016 presidential election by the Kremlin, according to Reuters.
Asked Tuesday about the testimony, President Donald Trump was tight-lipped: "I wish him luck", he told reporters.
Among those anonymous leaks is the most potentially damaging allegation against Trump, that he may have asked Comey to drop his investigation into the president's former national security adviser Michael Flynn.
It was not immediately clear when the conversation occurred. Comey was trying to prevent George W. Bush's men from obtaining the signature of Ashcroft - ill and resting in a hospital bed - on a document reauthorizing the Bush administration's domestic surveillance program, found by the Justice Department to be illegal. Justice Department spokesman Ian Prior explained to the Times that Sessions thought it was inappropriate to comment on "matters that may be related to ongoing investigations".
And this: Trump allies are running anti-Comey ads, to muddy him up before -and during - the hearing.
The Senate panel is one of several committees on Capitol Hill probing Trump's team and their relations with Russian Federation. "So we need to hear directly from Mr. Comey on these important issues". And Comey says he made a decision to share "more detail about our process than I ordinarily would because I think the American people deserve those details in a case of intense public interest".
Comey got himself fired May 8 when he wouldn't play ball with the new president by looking the other way when it came to Flynn.
Trump himself invoked Nixonian symbolism last month, when he warned via Twitter that Comey "better hope that there are no "tapes" of our conversations".
Sessions, according to the Times, did not guarantee that Trump would not attempt to contact Comey while alone again.
If he comes close to affirming in public the same level of concern that associates have said he expressed in private, it will be an explosive hearing that could further cloud Trump's White House with questions of whether he sought to obstruct justice, a potentially impeachable offense.
Warner said he also wants to ask Rosenstein about Comey's firing.
The event was scheduled five weeks ago as a review of the Foreign Intelligence Surveillance Act, but it quickly morphed into another chance for lawmakers to get some answers on the Justice Department's investigation into President Donald Trump's campaign and Russian meddling in the United States election.
The alleged links between his campaign and Moscow have dogged Mr Trump's fledgling presidency, despite his repeated claims that they are "fake news" pushed by his defeated Democrat opponents as an excuse for his election victory. More than three-quarters of independents say they trust Trump's statements about Russian Federation "just some" or not at all.