The two presidential nominees stood near each other at the event in lower Manhattan, with President Joe Biden and former New York City Mayor Mike Bloomberg standing between Harris and Trump. Sen. JD Vance, R-Ohio, Trump's vice presidential nominee, and former New York City Mayor Rudy Giuliani also attended the ceremony.
During the ceremony, a woman who lost her husband in the 2001 terrorist attacks criticized Biden for saying to reporters Tuesday that he would be “doing 9/11” on Wednesday as part of his attendance at the day's memorial events. The woman called it “quite a flippant remark” — one of the only outright political statements heard during the ceremony.
White House press secretary Karine Jean-Pierre said Biden and Harris were attending because "they want to honor the 2,977 lives that were lost on that tragic day and support the families and also their loved ones who are still, still feeling a horrible pain."
Biden, Harris, Trump and Vance stayed at the service, which began at 8:30 a.m. ET, for over an hour before departing.
Once Trump and Vance left ground zero, they stopped by Engine Company 4, Ladder Company 15 fire station in lower Manhattan to meet and take photos with firefighters, some of whose members died responding to the 9/11 attacks. Trump and Vance were joined by campaign staff, the former president’s sons, Donald Trump Jr. and Eric Trump, and far-right activist Laura Loomer, who was with the former president at the debate Tuesday night and has spread conspiracy theories about the attacks.
Vance and former House Speaker Kevin McCarthy, R-Calif., also visited the offices of financial services firm Cantor Fitzgerald, now at 55 Water Street in lower Manhattan, whose corporate headquarters were based out of the top floors of the World Trade Center’s North Tower on 9/11. The company said that 658 of its employees died that day. Vance thanked the firm in brief remarks for its work to raise money for the families of 9/11 victims.
Harris and Biden later traveled to Shanksville, Pennsylvania, home of the Flight 93 memorial, and participated in a wreath-laying ceremony at the site. It is believed that an attack on the U.S. Capitol was prevented on Sept. 11, 2001, due to the actions of the flight's 40 passengers and crew who died when the plane crashed into a field in Shanksville.
Trump is also expected to visit the memorial site.
The president and vice president also visited Shanksville's volunteer fire department to meet with firefighters and the families and friends of Flight 93 victims. Biden and Harris stood side by side with a woman and a firefighter to look at a large silver cross that was erected at the firehouse with the letters "WTC" inscribed at the bottom. Before walking inside to meet with families, Biden stopped there and bowed his head and crossed himself.
Biden and Harris are scheduled to head to another 9/11 event, at the Pentagon, at 5 p.m. ET.
Harris' running mate, Minnesota Gov. Tim Walz, is commemorating the 9/11 anniversary in his home state.
Presidential candidates traditionally refrain from campaigning on the anniversary of the deadliest terrorist attack in U.S. history, but they have crossed paths at 9/11 memorials in previous election cycles.
In 2016, Trump and former Secretary of State Hillary Clinton — then the Democratic presidential nominee — attended a 15th anniversary service, but she departed abruptly and appeared unsteady as she left. Her campaign said she felt "overheated," adding later that she had been diagnosed with pneumonia.
Trump used the incident to question Clinton's stamina and whether she was "tough" enough to be president.
Trump, as president, and Biden, the Democratic nominee, attended the 9/11 Memorial & Museum’s annual commemoration at ground zero in 2020, when Biden spent time consoling family members who lost loved ones in the attacks.
Trump and Biden that day also went to Shanksville, where Biden laid a wreath at the memorial and met with family members and Trump delivered a speech vowing that “America will always rise up, stand tall and fight back.”
Harris went to the New York memorial service last year, while Biden, who was traveling back from Asia, marked the anniversary at an Air Force base in Alaska.
As he's scheduled to do this year, Biden went to all three of the attack memorial sites in 2021 — the 20th anniversary.
Trump, a New York native, did not attend the memorial in 2021, making stops instead at a police station and a firehouse.
He marked the anniversary with a video statement last year. “No one who lived through the horror of the Sept. 11 terrorist attacks can ever forget the agony and the anguish of that terrible day. It was a terrible day," he said in the video. “We will never forget.”
Jake Traylor is a 2024 NBC News campaign embed.
Jake Traylor is a 2024 NBC News campaign embed.
Lindsey Pipia is an Associate Producer for the 2024 Political Desk.
Dareh Gregorian is a politics reporter for NBC News.
Rebecca Shabad is a politics reporter for NBC News based in Washington.