A bombshell new book exposed the truth about Joe Biden’s mental decline.

But one former President is sticking to a different story.

And Bill Clinton made one stunning claim about Biden that left everyone scratching their heads.

New book reveals the Biden White House cover-up

CNN’s Jake Tapper and Axios reporter Alex Thompson dropped a political bombshell with their new book "Original Sin: President Biden’s Decline, Its Cover-Up, and His Disastrous Choice to Run Again."

The book details how Biden’s inner circle worked overtime to hide his cognitive and physical decline from the American people.

It paints a picture of a White House staff desperately trying to manage a President who was losing his grip on reality.

The revelations in the book explain why Biden’s debate performance against Donald Trump was such a disaster.

Millions of Americans watched in horror as Biden fumbled through answers and appeared confused on the debate stage.

That catastrophic performance ultimately forced Biden to drop out of the race under pressure from his own party.

Bill Clinton defends Biden despite overwhelming evidence

CBS’s "Sunday Morning" correspondent Tracy Smith asked former President Bill Clinton about the explosive allegations in the book.

"Did you ever have a moment with him where you thought maybe he was unfit to run for president?" Smith asked Clinton.

Clinton’s response was mind-boggling given everything Americans witnessed with their own eyes.

"No," the 78-year-old Clinton said flatly. "I thought he was a good president."

Clinton went even further in his defense of Biden’s mental state.

"The only concern I thought he had to deal with was, could anybody do that job until they were 86?" Clinton said. "And we did several long talks. I had never seen him and walked away thinking, He can’t do this anymore. He was always on top of his briefs.”

When pressed again about Biden’s obvious decline, Clinton doubled down on his denial.

"I didn’t know anything about any of this. And I haven’t read the book. And I saw President Biden not very long ago, and I thought he was in good shape," Clinton insisted.

Clinton refuses to face the obvious truth

Clinton went on to say he didn’t want to read the book because he believes some people are using it as a "way to blame" Biden for Trump being reelected.

"I didn’t want to because he’s not president anymore, and I think he did a good job," Clinton explained. "And I think we are facing challenges today without precedent in our history. And some people are trying to use this as a way to blame him for the fact that Trump was re-elected."

Clinton’s refusal to acknowledge what everyone could see raises serious questions about whether he’s being honest or if he’s simply protecting the Democrat Party brand.

The American people watched Biden stumble through speeches, get lost walking off stages, and appear confused during public events.

Video after video showed Biden’s mental decline in real time.

Yet Clinton wants everyone to believe he never noticed anything wrong during his conversations with Biden.

Republicans demand answers about the cover-up

House Oversight Chairman James Comer (R-KY) is now investigating the Biden White House’s efforts to hide the President’s condition.

Comer has demanded testimony from Biden’s doctor and former White House aides who may have participated in the cover-up.

The timing of recent health revelations about Biden makes the situation even more suspicious.

It was recently disclosed that Biden is fighting an "aggressive form" of prostate cancer.

Many are questioning why this information is only coming out now that Biden is out of office.

Biden lashes out at book authors

Biden himself showed his true colors when confronted about the controversy surrounding his mental and physical health.

"You can see that I’m mentally incompetent and I can’t walk, and I can beat the hell out of both of them," Biden snarled, apparently referencing the book’s authors Tapper and Thompson.

Biden’s angry response only proves that he knows the book hit too close to home.

A President who was truly confident in his mental abilities wouldn’t need to threaten violence against journalists.

The outburst was yet another example of Biden’s lack of self-control and poor judgment.

Clinton’s decision to defend Biden despite overwhelming evidence of decline shows how far Democrats will go to protect their own.

The American people deserve better than politicians who refuse to tell the truth about something as serious as a President’s fitness for office.