Days ahead of officially dropping out of the 2024 race, President Biden declared in a media interview that a medical diagnosis from a doctor would likely sway him to reconsider running for a second term. 

"If I had some medical condition that emerged," Biden said, when asked in a BET interview this month if there was a reason that would make him reconsider running in 2024. "If doctors came to me and said, ‘You got this problem, that problem.’"

Following weeks of adamant declarations from Biden and his campaign that he was staying in the race, the president dropped out on Sunday afternoon, and shortly after endorsed Vice President Kamala Harris for president. 

"My fellow Democrats, I have decided not to accept the nomination and to focus all my energies on my duties as President for the remainder of my term," Biden posted on X Sunday afternoon announcing his support for Harris.

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President Joe Biden saluting

President Biden salutes while arriving during an event at the White House on Nov. 27, 2023. (Michael Reynolds/EPA/Bloomberg via Getty Images)

"My very first decision as the party nominee in 2020 was to pick Kamala Harris as my Vice President. And it’s been the best decision I’ve made. Today I want to offer my full support and endorsement for Kamala to be the nominee of our party this year. Democrats – it’s time to come together and beat Trump. Let’s do this," he continued. 

Biden is self-isolating in his home Rehoboth Beach, Delaware, after a COVID-19 diagnosis last week. He said he would address the nation with more information about his departure "later this week." 

"Our president, Joe Biden wanted to be here today. He is feeling much better and recovering fast, and he looks forward to getting back on the road," Harris said Monday in her first public remarks since Biden's departure from the race. 

White House physician Dr. Kevin O'Connor released an update Monday afternoon that Biden's symptoms have "almost resolved completely" and that he "continues to perform all of his presidential duties." 

For years, Biden’s health has been of concern to conservatives, including former White House doctor Ronny Jackson, before the concerns snowballed following Biden’s disastrous debate against former President Trump last month. The debate performance – which included Biden stumbling over his words, trailing off on his thoughts and answering questions in a much more subdued manner than during previous public events – opened the floodgates to legacy media outlets and Democratic allies calling on Biden to drop out over concerns about his mental fitness and age. 

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Biden and the administration have hit back that Biden’s mental fitness is sound and that he does not have dementia, Parkinson’s or other diseases. Biden’s brother, however, said following Sunday’s announcement that the president’s health "absolutely" played a role in his decision not to seek re-election just weeks ahead of the Democratic National Convention. 

Frank Biden in sunglasses speaking

Frank Biden, younger brother of President Joe Biden, in 2011. (Joe Cavaretta/Sun Sentinel/Tribune News Service via Getty Images)

"I'm incredibly proud of my brother. Selfishly, I will have him back to enjoy whatever time we have left. He is a genuine hero. Country over self. Sounds corny in our cynical political environment, but he nor I are cynical. The goal remains the same, defeat Trump and continue the work that Joe has done. My hope is that our party rallies around this heroic act," Frank Biden told CBS News on Sunday. 

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"In my humble opinion, absolutely," he said when asked if his brother's health played a role in him bowing out. 

Following Frank Biden’s comment, a source close to the Biden family told CBS that the president’s brother is an alcoholic and his claims were "completely untrue." 

"Frank Biden suffers from alcoholism and hasn’t spoken to his brother, the president, in weeks. What he said about President Biden’s health being a factor in his decision is completely untrue," the source told the outlet. 

Deputy Press Secretary Andrew Bates at press briefing lectern

Deputy press secretary Andrew Bates recently complained about journalists questioning Biden's mental acuity after the Hur report called out the president's "poor memory." (Getty Images)

White House spokesman Andrew Bates told Fox News Digital when asked about the president’s health that it did not play a role in his decision to drop out of the race. 

"No. Health was not a factor," Bates said Monday morning. 

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Concerns surrounding Biden’s mental acuity stretch back to the 2020 election, when White House doctor under the Obama and Trump administrations, Ronny Jackson, sounded the alarm that he didn’t believe Biden was mentally fit for office. 

"As a citizen, not as a candidate running for Congress, but as a citizen of this country, I’ve watched Joe Biden on the campaign trail and I am concerned and convinced that he does not have the mental capacity, the cognitive ability, to serve as our commander in chief and our head of state," Jackson, who is now a Republican congressman representing Texas, said in 2020. 

Ronny Jackson in Navy uniform in 2018 photo

Rear Adm. Ronny Jackson on Capitol Hill on April 24, 2018. (Tom Williams/CQ Roll Call)

The concerns have mounted since, most notably in February of this year when Special Counsel Robert Hur published his report investigating the president's handling of classified documents after his departure as vice president in the Obama administration. 

The report stated Hur would not recommend criminal charges against Biden for possessing classified materials after his vice presidency, calling Biden "a sympathetic, well-meaning, elderly man with a poor memory."

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His mental fitness again came under scrutiny when the Wall Street Journal published a piece earlier this year based on dozens of interviews with lawmakers and administration officials who characterized Biden as losing his mental edge and showing his age in meetings. The White House slammed the article as a partisan hit piece

In addition to concerns over Biden’s mental acuity, he previously ​​suffered two brain aneurysms in 1988 that nearly claimed his life. 

Joe Biden with Jill in 1988 campaigning

Sen. Joe Biden and his wife, Jill, are surrounded by supporters and news media at a rally in Wilmington, Delaware, 1988. (PhotoQuest/Getty Images)

"If he did survive, there was a chance that the part of his brain that governed his speech would be damaged," newly-released book "American Woman," authored by New York Times White House correspondent Katie Rogers, reported of the 1988 health scare.

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Amid mounting concerns over his mental fitness, Biden was mocked and criticized on social media for a handful of gaffes and miscues during public events in recent months. Those include: former President Obama taking Biden’s wrist to seemingly lead him offstage at a fundraiser in Los Angeles in June; Italian Prime Minister Giorgia Meloni directing Biden back to a gaggle of world leaders in Italy this summer after he took a few steps away from the group to give a thumbs up to a parachutist; and viral video showing the president standing relatively motionless during a Juneteenth concert event at the White House. 

Obama helps Biden leave stage

President Obama takes President Biden by the wrist at fundraising event. (Christopher Gardner via Storyful)

The floodgates for criticizing the president’s age and mental acuity opened on June 27, when he delivered his botched debate performance, with Democratic elected officials and traditional allies in political and media orbits calling on Biden to bow out of the race out of concern he could not defeat Trump. 

Biden and his campaign, however, repeatedly denied he would bow out of the race and hit back against claims his mental fitness had slipped. 

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"Joe Biden has made it more than clear: he’s in this race and he’s in it to win it. Moreover, he’s the presumptive nominee, there is no plan for an alternative nominee," a campaign memo released just two days before Biden dropped out read. 

closeup of Joe Biden on CNN debate stage

President Biden at his podium during the debate against former President Trump at CNN's studios in Atlanta on June 27, 2024. (Kevin D. Liles for The Washington Post via Getty Images)

Harris appears to be the likely replacement for Biden as she gains additional endorsements from heavy-hitting Democrats such as former President Clinton and Hillary Clinton.

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Trump responded to the news of Biden dropping out by lambasting him as the "worst president" and remarking that Harris would be an easier Democratic nominee to defeat. 

Vice President Kamala Harris closeup shot

Vice President Kamala Harris speaks in Baltimore, Maryland, on July 14, 2023. (Saul Loeb/AFP via Getty Images)

"He is the worst president in the history of our country," Trump told Fox News Digital in a phone interview on Sunday afternoon. "There has never been a president so bad."

"He is not fit to serve," Trump continued. "And I ask: Who is going to be running the country for the next five months?" 

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The Democratic Party will officially nominate its candidate for president next month. 

Get the latest updates from the 2024 campaign trail, exclusive interviews and more at our Fox News Digital election hub.