Hours after his address to the Democratic National Convention, Bill Clinton was back on the offensive, flatly dismissing allegations that his recently published autobiography included a fabricated account of a conversation with Kennedy School of Government professor Roger B. Porter.

In an exclusive interview in Cambridge early Tuesday morning, Clinton told The Crimson that Porter’s claims about the book, My Life, were simply “not true.” But, despite the hour, Porter wasted little time answering right back, sharpening his criticisms of Clinton’s account and expanding their scope.

Clinton had written in his memoir that Porter, who was Economic and Domestic Policy Adviser under President George H. W. Bush, had fired a warning shot at him.

“Here’s how Washington works,” Clinton quoted Porter as saying in My Life. “The press has to have somebody and we’re going to give them you...We’ll spend whatever we have to spend to get whoever we have to get to say whatever they have to say to take you out. And we’ll do it early.”

In June, after the autobiography was released, Porter said Clinton’s account was untrue, a charge the former president rebutted this morning.

“You don’t forget something like that,” Clinton said. “Just think about it. I wouldn’t make something like that up.”

But Porter scoffed when told of Clinton’s reply, noting that he would certainly remember so important an exchange.

“Why would anybody believe him?” Porter told The Crimson early Tuesday morning. “He is absolutely correct that I would not have forgotten a conversation like that, and that just buttresses my claim that such a conversation never took place.”

In his book, Clinton cited the exchange as one of the primary motivating factors behind his first presidential run in 1992. Though he was comfortably situated in Arkansas at the time and hesitant to abandon his position, Clinton wrote, a telephone call from Porter “showed what was wrong with [George H. W. Bush’s] administration.”

According to Clinton’s book, Porter—who is Dunster House Master and IBM professor of business and government—said that while other potential Democratic opponents could be undermined through weaknesses grounded in their politics, the Arkansas governor’s voting record made him “different.” According to Clinton, this also made him a prime candidate for a Republican-orchestrated smear campaign.

“Subsequent events sort of confirmed that,” Clinton said early Tuesday morning, referring to the scandals that plagued his second term of office. “When [the call] happened, I respected it, but I didn’t fold.”

Clinton cited conversations he had immediately after the phone call to support his version of the account.

“As soon as I hung up the phone, I called Hillary,” Clinton said Tuesday morning, “and then I called Mack McLarty,” his future chief of staff.

But Porter told The Crimson in June that the only conversation he can recall with the Arkansas governor came during President Bush’s 1989 Education Summit with the Governors, where he joked with Clinton about how the rising politician ought to run for president in much the same fashion as Ronald Reagan—as a Republican.

“We never had any conversation as he has described in his book,” Porter said in June. “You don’t remember every conversation in life, but I would certainly remember a conversation like that.”