President Joe Biden and Vice President Kamala Harris participated in a wreath-laying ceremony at the Pentagon to commemorate the 23rd anniversary of 9/11.

64 people were killed when terrorist hijackers crashed American Airlines Flight 77 into the Pentagon on September 11, 2001.

Biden and Harris earlier visited Pennsylvania and New York City for 9/11 memorials.

President Biden briefly put on a red Trump hat Wednesday during a visit to a fire station in Shanksville, Pa., where he mingled with first responders after marking the 23rd anniversary of the Sept. 11, 2001, terrorist attacks.

Footage of Biden, 81, donning the hat was quickly shared by the Trump-Vance campaign and the White House later confirmed that the president had tried on the headwear in the spirit of bipartisanship.

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Former President Donald Trump visited the Shanksville Volunteer Fire Company in Shanksville, Pa., to commemorate the 23rd anniversary of 9/11.

Shanksville is where United Flight 93 crashed after passengers and crew attempted to fight off the hijackers and retake the plane.

Trump participated in a wreath-laying ceremony and visited the Wall of Names of the victims.

President Biden and Vice President Harris flew to Shanksville, Pa. to attend a 9/11 memorial ceremony.

Shanksville is the site where Flight 93 crashed after passengers and crew members fought back against the hijackers and attempted to retake control of the plane.

The hijackers had intended to crash the plane into the US Capitol Building, but were prevented by the heroism of those on board.

After the final names were read the 9/11 memorial ceremony came to a solemn end.

The sister of John James Tipping II, a firefighter who died heroically trying to save lives on 9/11, read a gut-wrenching poem written by his niece when she was 12.

"15 brave men were killed that day from John's firehouse," the woman said, "and from the onset, the men there have been there for us and the grieving families, despite their own grief... 23 years later their comfort and support remains."

The grief-stricken sister went on to read a poem entitled "The Best Go First" written 23 years ago by the slain firefighter's niece Spencer.

"The Best Go First
When the unsavable need saving and the unreachable need to be reached/
the best help first/ And when their perilous work is called for/
the best answer first
and when going in may mean they may not come back out/
the best enter first
and when life is at risk
they put others first/ and when death comes silently lurking
the best go first."

During a visit to BCG, a division of Cantor Fitzgerald, Republican Vice Presidential Candidate JD Vance related a story of a child who was born on September 13, 2001 just two days after his firefighter dad died heroically trying to save lives on 9/11.

"It is such an amazing thing to see both the tragedy of 911 but the incredible lives that people have built out of that tragedy," Vance said.

"So one of the firefighters, of course, who died at that fire station, his wife, was pregnant with their fourth baby, and that kid was born two days later on September the 13th, he's going to have his third, 23rd birthday on September the 13th."

"I met him, I met his brother, and I met his sister. And those guys know that you all are supporting them. They know that you guys haven't forgotten about them," Vance said in reference to the charity efforts for the victim's families done by the firm.

Republican Vice Presidential candidate J.D. Vance visited the offices of BCG, a brokerage company that is part of Cantor Fitzgerald to commemorate the 23rd anniversary of 9/11.

Cantor Fitzgerald lost 658 employees during the horrific terrorist attacks. Their NYC headquarters, which were located two floors above the impact zone of American Airlines Flight 11 on the 101st to 105th floors of One World Trade Center, were completely destroyed.

Today is BCG's charity trading day which raises money for the victim's families.

"I know you're working your asses off to make sure that you support the families of the people who died in these terrible attacks," the GOP vice presidential candidate said, "They know that you guys haven't forgotten about them."

The cousin of a young woman who was killed on Sept. 11, 2001, wondered out loud about her late relative’s last moments during the memorial ceremony in New York City.

“Did you panic? Were you calm?” said the cousin of Jenine Nicole Gonzalez, who was just days away from her 28th birthday when she was killed in the terror attack on the World Trade Center.

Gonzalez worked as an executive assistant at Aon Corporation, and was in her office on the 105th floor when the building was hit by a plane and later collapsed.

Gonzalez was remembered as an “eternal beauty” and a “fiery and fierce spirit” by her loved one, who was one of dozens of relatives who read out the names of the nearly 3,000 victims.

Former President Donald Trump and his running mate Sen. JD Vance (R-Ohio) visited with FDNY Engine 4 Ladder 15 just before the 10:28 moment of silence during the 9/11 memorial Wednesday morning.

Trump, 78, arrived at the firehouse in an SUV. He was seen shaking hands and talking with members of the service and their families.

The firehouse lost 14 members on 9/11. One captain, one lieutenant, and 12 firefighters died trying to save lives during the heinous attacks.

He did not come out of the firehouse for the moment of silence, which marked the moment the North Tower collapsed 23 years ago.

The 9/11 memorial ceremony in downtown New York City paused at 10:28 a.m. to acknowledge the moment when the North Tower of the World Trade Center collapsed 23 years ago.

The North Tower was struck by American Airlines Flight 11 shortly before 9:00, and burned for over an hour before it fell.

A New York City resident who was just a preteen on Sept. 11, 2001, reflected on the 9/11 attacks near the downtown memorial ceremony Wednesday morning.

Anthony Flesher, now 35, was 12 years old and living in Iowa 23 years ago.

He spoke to The Post today from the Oculus, just steps from where the World Trade Center stood.

“It’s a good idea for anyone who wasn’t alive on 9/11 or doesn’t have a clear memory of the day to reflect on it and try to imagine what it would have been like to be down here on the street and especially for the firefighters and police officers running towards the towers,” Flesher said.

He encouraged those who were not near one of the scenes on 9/11 or was too young to remember to watch videos about the attacks.

“I’ve never been here on the anniversary. I didn’t realize the families had the memorial to themselves but it makes sense because this is when they lost their loved ones,” he added.

“It’s hard to imagine being here in 2001, all the chaos right here where we’re standing. Hearing the bells ring out and seeing the families mourn, it’s solemn and sorrowful.”