On Thursday, Rep. James Comer (R-KY), the Chairman of the House Committee on Oversight and Government Reform, sent a <a href="https://oversight.house.gov/wp-content/uploads/2025/05/05-22-2025-Letter-to-Dr.-OConnor.pdf" target="_blank" rel="noopener">letter</a> to former White House physician Dr. Kevin O’Connor, alerting him that he is being investigated for his medical assessments of former President Joe Biden, who has been diagnosed with stage 4 prostate cancer that has spread to his bones.
“The Committee on Oversight and Government Reform is investigating the accuracy, transparency, and credibility of your medical assessments of former President Joe Biden given his recent acknowledgment of an advanced physical condition and a publicly apparent cognitive decline,” Comer wrote, noting that the Committee had first written to O’Connor on July 7, 2024, 10 days after the Trump-Biden debate in which Biden had shown clear signs of a mental decline.
“Biden White House officials stalled all attempts by the Committee to obtain your testimony,” Comer recalled. “In light of mounting evidence that confirms the Committee’s initial observation that President Biden was significantly unwell while serving in office, the Committee seeks information to ensure accurate information was provided to the American people and your health reports were not subject to any improper influence.”
Daily Wire White House Correspondent Mary Margaret Olohan asked White House Press Secretary Karoline Leavitt on Monday if the White House would further scrutinize O&#8217;Connor.
<blockquote class="twitter-tweet" data-width="500" data-dnt="true">
.<a href="https://twitter.com/MaryMargOlohan?ref_src=twsrc%5Etfw">@MaryMargOlohan</a>: &quot;Is there interest in further scrutiny of Kevin O&#39;Connor, the former president&#39;s physician?&quot;<a href="https://twitter.com/PressSec?ref_src=twsrc%5Etfw">@PressSec</a>: &quot;[President Trump] wanted to extend his warmest wishes to the former president &#8230; as for any further action, I&#39;ll let the President speak on that first.&quot; <a href="https://t.co/XTogdSMjSQ">pic.twitter.com/XTogdSMjSQ</a>
&mdash; Daily Wire (@realDailyWire) <a href="https://twitter.com/realDailyWire/status/1924461438095016436?ref_src=twsrc%5Etfw">May 19, 2025</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
In early July 2024, White House spokesman Andrew Bates said, “Dr. O’Connor is a world class medical professional” whose “unique expertise is sought across the medical community, in which he is respected for his candor, attention to detail, and work ethic,” The Washington Post <a href="https://www.washingtonpost.com/politics/2024/07/06/kevin-oconnor-biden-doctor-cognitive-tests-debate/" target="_blank" rel="noopener">reported</a>.
O’Connor, an osteopathic physician who <a href="https://www.washingtonpost.com/politics/2024/07/06/kevin-oconnor-biden-doctor-cognitive-tests-debate/" target="_blank" rel="noopener">became</a> Biden’s doctor in 2009, said in February 2024 that Biden was “a healthy, active, robust 81-year-old male, who remains fit to successfully execute the duties of the Presidency.”
The committee is also investigating whether O&#8217;Connor&#8217;s “financial relationship with the Biden family affected [his] assessment” of the former president&#8217;s fitness to serve. 
“Given your connections with the Biden family, the Committee seeks to understand if you contributed to an effort to hide former President Biden’s fitness to serve from the American people,” Comer warned, mentioning Special Counsel Robert Hur’s interview with Biden that had depicted Biden as deteriorating mentally.
Looking forward, Comer stated, “The Committee seeks information about your assessment of and relationship with former President Biden to explore whether the time has come for Congress to revisit potential legislation to address the oversight of presidents’ fitness to serve pursuant to its authority under Section 4 of the Twenty-Fifth <a href="https://constitutioncenter.org/the-constitution/amendments/amendment-xxv">Amendment</a>.”
In August 2020, Biden, then 77, was asked whether he had taken a cognitive test. “Why the hell would I take a test?” he answered testily.
“We request you make yourself available for a transcribed interview on June 25, 2025,” Comer concluded.

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Kevin O'Connor

House GOP Investigating Biden’s Doc, Who Said He Was ‘Fit’ To ‘Execute The Duties Of The Presidency’