Michael Cohen’s time in court may be over, but his former lawyer, Lanny Davis, believes Cohen still has more to say. “He can be the next generation of what John Dean was to Richard Nixon,” Davis said when we talked Thursday, some 24 hours after Cohen was sentenced to three years in prison for violating campaign-finance laws when he paid two women to stay silent about alleged affairs with Donald Trump. “He should be sitting in front of a congressional committee and telling the truth the way that John Dean did,” Davis continued.

It is a comparison that Davis has made often: Cohen as the modern-day John Dean, the infamous White House counsel who helped take down Nixon in the Watergate scandal, and who redeemed himself in the process. Davis, once a power player in Clintonworld, joined Cohen’s legal team in July, as the former Trump lawyer faced down the Southern District of New York in a wide-ranging investigation into his business dealings, including the payments he orchestrated to Stormy Daniels and Karen McDougal. After Cohen pleaded guilty, Davis stopped serving as his lawyer. (“Now that I am an adviser, I am not worried about breaking attorney-client privilege,” he said.)

But Davis is continuing to advise Trump’s former “fixer” on how to navigate the post-conviction landscape. Specifically, he said, he wants Cohen to appear before Congress after Robert Mueller concludes his Russia investigation—and dish on his former boss. “I think he should talk about everything,” Davis told me. “Go to Congress, and turn the television cameras on, and tell us all that you know about Donald Trump over the years. Not just about the Mueller investigation—over the years.”

This, said Davis, would be “chapter two” in the story of Michael Cohen. “He’s got to start by taking ownership that he did a lot of shameful things for Donald Trump.” (On Thursday morning, Trump responded that any campaign-finance violations were committed by Cohen—and Cohen alone. “He was a lawyer and he is supposed to know the law,” the president wrote on Twitter, before taking a swipe at Cohen’s family. “Those charges were just agreed to by him in order to embarrass the president and get a much reduced prison sentence, which he did—including the fact that his family was temporarily let off the hook.”)

Davis didn’t elaborate on what information, exactly, Cohen would or should share with congressional investigators. But, he suggested, there is much more that Cohen knows that hasn’t yet been made public. Cohen, who spent years representing Trump and conducting business on behalf of the Trump Organization—including a failed bid to develop a Trump Tower in Moscow at the height of the 2016 campaign—spent roughly 70 hours spilling his guts to the special counsel’s team. (Mueller applauded his cooperation, which he said included “useful information concerning certain discrete Russia-related matters core to” the Russia probe.) Whatever Cohen shared, it was juicy enough that the special counsel didn’t request additional jail time outside of what the S.D.N.Y. recommended.

Certainly, on Capitol Hill, there is an appetite for a Cohen hearing—at least among Democrats. When CNN’s Wolf Blitzer asked Adam Schiff, the likely incoming chairman of the House Intelligence Committee, whether he would call Cohen to appear before the panel, the California congressman didn’t hedge. “We are already in touch with his counsel. We are very eager to have him come and testify,” Schiff said. Whether the session would be public—as Davis wants—or behind closed doors, remains to be seen. “We’ll have to make a decision on a case-by-case basis,” Schiff said. “That may be the product of some internal discussion and debate—or agreement with witnesses, depending on the circumstances.”

While he wouldn’t detail the threat Cohen could pose to Trump if he chose to air the president’s dirty laundry, Davis believes the prospect of Cohen going full John Dean should terrify the White House. “[That] is why Trump is attacking him, and is so obsessed with him, and even now attacking his father-in-law and wife,” he concluded. “Attacking a man’s wife and family to change the subject about his own wrongdoing is lower than even I thought Donald Trump would go.”