Fox News' Peter Doocy has some unique insight on former President Joe Biden as questions continue to persist about whether there was a coverup to hide his declining mental state while serving as commander-in-chief. 

Doocy, a senior White House correspondent, posted multiple videos to X on Wednesday showing him questioning Biden and the White House about the then-president's cognitive decline. 

"I have some unique insight on President Biden, having dedicated six years of my life to covering him," he wrote. "If you are wondering why nobody asked about his mental fitness, and why nobody asked if White House staffers were covering up his decline… then you weren’t paying attention."

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In one video, Doocy is seen questioning Biden about Special Counsel Robert Hur's report that concluded that one of the reasons Biden wasn't charged for his handling of classified Obama-era documents found in his former office and at home was because he was a "well-meaning, elderly man with a poor memory."

"I'm well-meaning and I'm an elderly man and I know what the hell I'm doing. I put this country back on its feet. I don't need his recommendation," Biden replied.

Doocy then asked how bad Biden's memory was and would he be able to continue to serve as president. 

"My memory is so bad, I let you speak," Biden shot back. 

Much of the media has been criticized for its reluctance to question Biden or the White House about his health concerns. The former president's health is once again in the headlines after CNN anchor Jake Tapper and Axios correspondent Alex Thompson's new book, "Original Sin: President Biden's Decline, Its Cover-Up, and His Disastrous Choice to Run Again," was released on Tuesday.

The book alleges that Biden’s inner circle concealed his cognitive decline for years and was released just days after news broke that Biden had been diagnosed with advanced prostate cancer.

In one instance, during a news briefing, Doocy questioned then-White House Press Secretary Karine Jean-Pierre about a campaign event in which Biden was present. 

"At a fundraiser this week, President Biden told donors about how Charlottesville inspired his campaign, and according to the pool, a few mins later he told the story again nearly word for word. What's up with that?"

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"What I can tell you is, and I'm going to be careful not to talk about it because this was a campaign event,… the president was making very clear why he decided to run in 2019," Jean-Pierre responded. 

In another briefing, Jean-Pierre said Biden was making a "light-hearted joke" and "speaking off the cuff" when she was asked by Doocy about Biden's remarks that his "health is fine. It's just his brain."

In another video, Jean-Pierre was asked about Biden's gaffe when he appeared to mix up French President Emmanuel Macron with François Mitterrand, the former president of France who died in 1996.

"How is President Biden ever going to convince the three-quarters of voters who are worried about his physical and mental health that he's OK even though in Las Vegas he told a story about recently talking to a French president who died in 1996?"

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"I'm not even going to go down that rabbit hole with you," she replied. 

Doocy also asked if Biden had been tested for Parkinson's Disease or dementia following his disastrous debate performance against then-candidate Donald Trump.

"What we shared with you was comprehensive, but he's had a full physical. We've shown the results of those this past three years," Jean-Pierre said. "We showed it just four months ago, and it is in line with what we have done, similar to President Obama, similar to George W. Bush. We are committed to continue to be transparent. We are committed to continue to show the results of those physicals, and look, it's the president's medical team that makes a decision."

In another briefing, Jean-Pierre was questioned about why Biden was treated by White House staffers "like a baby."

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"No one treated the president of the United States, the commander-in-chief, like a baby," she replied. "That's a ridiculous claim."

Fox News Digital's Kristine Parks contributed to this report.

EXCLUSIVE: Bombshell developments continue to emerge about former President Joe Biden’s declining health along with allegations of a White House cover-up. In response, a top Republican is urging the Justice Department to investigate whether any laws were broken in how Biden’s condition was presented to the public.

Sen. John Cornyn of Texas is expected to write Wednesday afternoon to Attorney General Pam Bondi demanding that the DOJ open a probe into "any potential violations of federal law surrounding the representations made to the American people about the health and wellbeing (sic) of then-President Biden."

In the letter obtained by Fox News Digital, Cornyn cited the May 18 report from Biden’s camp that he is battling late-stage aggressive prostate cancer that had metastasized to his bones.

"This announcement follows the publication of news reports calling into question the former president’s capacity and awareness during his time in office," Cornyn said as other Biden critics questioned what then-White House physician Dr. Kevin O’Connor knew while treating the president.

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In the letter, Cornyn expressed concern that Biden’s "associates," including O’Connor, misrepresented or made "material omissions" to the public about his mental and physical fitness.

Conservatives beat the drum of Biden’s alleged senility for years but were often lambasted by the mainstream media for questioning the White House’s line on the matter.

"I fear the American people were deliberately misled about President Biden’s health. Instead of providing full transparency, which is the obligation of the commander-in-chief, important information was kept secret," Cornyn wrote.

"I do not have confidence in the former president’s aides and staff, including medical staff, or their ability to be honest and straightforward about President Biden’s cancer diagnosis."

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He noted how President Donald Trump assented to calls that he take a cognitive test to demonstrate fitness for office while contrasting that with Biden's refusal, which famously resulted in a tense exchange with a CBS News correspondent when the then-president asked, "Why the hell should I take a test?" and asked if the Black news anchor was "a junkie" who might want to undergo a test for cocaine in his system.

Cornyn contrasted White House claims that Biden was "fit for duty" with revelations, including those in a CNN anchor’s new book, that he was only capable of working "four to six good hours" per day.

"These positions are in direct conflict," Cornyn will tell Bondi, adding that despite having the world’s best medical care at his fingertips, Americans have been asked to "accept coincidence after coincidence" involving his health.

He also cited the 25th Amendment, which he noted provides Americans an insurance policy that their government can continue to function if the infirmity or death of a president should occur.

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"These actions potentially impacted the trust the American people have in their government and weakened us on the world stage."

He cited a report from earlier this week that White House staff had secretly discussed the possibility that Biden would be confined to a wheelchair while still putting on a brave face to the public.

Former President Franklin Roosevelt, stricken by polio, conducted the nation’s business from a wheelchair.

"I encourage the Department to conduct a full investigation and ensure that no federal laws were violated during the previous administration," Cornyn concluded.

Fox News Digital reached out to a Biden representative for comment.