Timeline: The end of Biden's 2024 presidential campaign

President Joe Biden has dropped retired of the 2024 statesmanlike race aft his mediocre show successful a June statement against Donald Trump led to questions from the Democratic enactment and others astir his age, cognitive health, his quality to bushed Trump, and whether helium could service a 2nd term.

Here's a look astatine however the Biden run reached this historical determination to extremity Biden's candidacy for a 2nd term.

The archetypal debate

Biden, who astatine 81 is the oldest sitting president successful history, had already been facing concerns astir his property earlier the CNN statement against Trump connected June 27. However, Biden's statement show accrued questions not lone astir his quality to triumph against Trump, but his quality to execute his duties arsenic president for different term.

The president's show -- marred by a hoarse voice, often meandering answers, and a deficiency of beardown attacks against Trump connected cardinal issues -- near immoderate Democrats calling for him to measurement down.

Polls punctual further questions

The statement rapidly wounded Biden's campaign. The 2 candidates were conscionable astir tied connected the time of the debate, according to 538's nationalist polling average. After the debate, Trump led Biden by 2 percent points.

Amid the scrutiny, Vice President Kamala Harris, whom Biden endorsed arsenic his party's nominee successful Sunday's connection announcing the extremity of his candidacy, had already emerged arsenic a apt apical contender to regenerate Biden.

In an Ipsos poll astir a imaginable matchup betwixt Harris and erstwhile President Donald Trump, released connected July 2, Harris and Trump were astir tied, with 42% supporting her and 43% supporting the erstwhile president

FILE - President Joe Biden, left, and archetypal woman Jill Biden clasp hands arsenic they get astatine Fort Lesley J. McNair, Monday, July 1, 2024, successful Washington.

AP Photo/Jacquelyn Martin, Fil

Another canvass released by CNN successful the archetypal week of July recovered that a matchup betwixt the vice president and Trump resulted successful a 45-47% divided betwixt Harris and Trump, compared to the 43%-49% divided betwixt Biden and Trump.

Yet successful a poll released July 11, which asked elector preferences if Vice President Kamala Harris were to regenerate Biden arsenic the nominee, elector choices were 49-46%, Harris-Trump, among each adults and 49-47% among registered voters. Harris' 49% was somewhat amended than Biden's 46%, though it wasn't a statistically important pb implicit Trump.

Biden defends campaign, explains performance

President Joe Biden, successful his first tv interview pursuing the statement against Trump, brushed disconnected his mediocre performance.

"It was a atrocious episode," Biden told ABC News' George Stephanopoulos connected July 5. "No denotation of immoderate superior condition. I was exhausted. I didn't perceive to my instincts successful presumption of preparing and -- and a atrocious night."

MORE | Biden dismisses concerns astir intelligence fitness, says he'd driblet retired if the 'Lord Almighty' told him

Biden besides said helium was nether the upwind and "feeling terrible."

"I asked if they did a COVID trial due to the fact that they're trying to fig retired what was wrong. They did a trial to spot whether oregon not I had immoderate infection, you know, a virus. I didn't. I conscionable had a truly atrocious cold," the president said.

When Stephanopoulos asked: "If you tin beryllium convinced that you cannot decision Donald Trump, volition you basal down?"

Biden responded: "It depends connected if the Lord Almighty comes down and tells maine that, I mightiness bash that."

In a astir hourlong solo property league connected July 11, Biden insisted that he's champion situated to decision erstwhile President Donald Trump this November, and said helium was staying successful the contention contempt his shaky statement performance.

When asked if helium would see dropping retired if his squad showed information suggesting helium could lose, helium said: "No, unless they came backmost and said, 'There's nary mode you tin win' .... No 1 is saying that. No canvass says that."

Trump's assassination effort and the RNC

Former President Donald Trump was changeable successful the receptor successful an assassination attempt astatine an predetermination rally successful Butler, Pennsylvania, connected July 13.

Following the shooting, arsenic good arsenic the Republican National Convention the pursuing week, erstwhile President Donald Trump's favorability standing among Americans rose, portion a bulk of Americans wanted President Joe Biden to driblet retired of the race, according to an ABC News/Ipsos poll.

MORE | Timeline: How the Trump assassination effort unfolded

Trump's favorability standing accrued to 40% pursuing past week's events, marking his highest favorability standing successful 4 years of ABC News/Ipsos polling. For astir of the past 4 years, it has hovered successful the low- to mid-30% range.

Its precocious implicit the past 9 years was 42% successful August of 2020 according to an ABC News/Washington Post canvass conducted then. At the aforesaid time, astir fractional of Americans, 51%, presently presumption Trump unfavorably, according to this astir caller poll.

Biden run scrambles amid questions

ABC News reported that Biden's enactment from enactment leaders began to crumble arsenic reports that erstwhile House Speaker Nancy Pelosi, Senate Majority Leader Chuck Schumer, and different apical politicians spoke with him and his run astir the worsening reelection outlook.

On July 11, Biden's run began investigating head-to-head matchups of Vice President Kamala Harris against erstwhile President Donald Trump, a root acquainted with the strategy told ABC News.

Pelosi spoke with President Joe Biden astir the aforesaid time, telling the president that she and different members of the Democratic Party were acrophobic astir him staying successful the race, a root confirmed to ABC News.

Schumer besides had a gathering with Biden earlier this month. A knowledgeable root adjacent to some men told ABC News that Schumer made the lawsuit that it would beryllium champion if Biden dropped retired of the 2024 statesmanlike race.

However, connected July 19, Biden said helium would beryllium returning to the run way to proceed to instrumentality connected Trump pursuing his COVID-19 diagnosis.

MORE | President Joe Biden tests affirmative for COVID-19

President Joe Biden waves arsenic helium walks down the steps of Air Force One astatine Dover Air Force Base successful Delaware, Wednesday, July 17, 2024.

AP Photo/Susan Walsh

"I look guardant to getting backmost connected the run way adjacent week to proceed exposing the menace of Donald Trump's Project 2025 docket portion making the lawsuit for my ain grounds and the imaginativeness that I person for America: 1 wherever we prevention our democracy, support our rights and freedoms, and make accidental for everyone," Biden said successful a statement.

According to a caller ABC News/Ipsos canvass released connected July 21, 60% of Democrats judge President Biden should driblet retired of the contention for reelection.

Biden drops retired successful historical move

Biden said successful a connection posted Sunday that helium volition "stand down."

"It has been the top grant of my beingness to service arsenic your President," helium wrote, successful part, successful a missive posted connected X. "And portion it has been my volition to question reelection, I judge it is successful the champion involvement of my enactment and the state for maine to basal down and to absorption solely connected fulfilling my duties arsenic President for the remainder of my term."

In different station connected societal media, Biden gave his "full enactment and endorsement" for Vice President Kamala Harris to beryllium the Democratic Party's nominee.

ABC News' Tal Axelrod, Gary Langer, Ivan Pereira contributed to this report.