During his 2016 presidential campaign, Trump made the false claim thousands of Muslims in New Jersey were cheering about the attacks after they heard the news.
And he greeted crowds with a double fist pump - sparking a huge backlash online. His leadership, bravery and skill must never be forgotten.
A man talks with a girl as they look at the North Pool at the World Trade Center during a ceremony marking the 17th anniversary of the terrorist attacks on the United States, Tuesday, Sept. 11, 2018, in NY. Some tearful readers mentioned how much they miss their loved ones.
Speaking at the Pentagon, one of the three sites attacked with hijacked airplanes on September 11, 2001, Trump said, "the terrorists who attacked us thought they could incite fear and weaken our spirit".
On Tuesday, White House Press Secretary Sarah Sanders said the president's focus will be on "remembering the lives that were lost" and honoring those who "put their lives on the line to help" respond to the tragedy.
The catastrophe saw 2,996 people lose their lives and more than 6,000 injured.
The Tribute in Light is seen in the sky above Lower Manhattan area of NY from across the Hudson River on the 17th anniversary of the Sept. 11 terror attacks, Tuesday, Sept. 11, 2018, in Jersey City, N.J. She headed into the memorial plaza with her extended family to honour her cousin Peter Carroll, a firefighter.
President Donald Trump will pay tribute to the victims at a ceremony in western Pennsylvania.
Hours after the ceremony, two powerful light beams soared soar into the night sky from lower Manhattan in the annual "Tribute in Light".More news: 'This hurts my heart': Celebrities mourn the death of rapper Mac Miller
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Sinodinos says it's better to commemorate the day there than to sit around "being depressed".
"I watched when the World Trade Center came tumbling down". She calls the progress "amazing".
Over the course of the morning, many public figures posted their solemn commemorations of the terror attacks.
Thousands of victims' relatives, survivors, rescuers are gathered at the September 11 Memorial in NY.
Mr Trump was accompanied by the First lady Melania, for this moment of national unity should offer him a temporary respite in the middle of a sequence to be particularly eventful.
This year, a new memorial stands in honor of the 40 passengers who were aboard Flight 93 when it crashed into a field in Shanksville.
A "Tower of voices" (Tower of Voices), a monument of almost 30 meters high erected in honor of the victims, has just been inaugurated in the middle of these hills, which are dotted in the distance of wind turbines.
Since the last anniversary, a truck attack on a nearby bike that killed eight people.
In December, a would-be suicide bomber set off a pipe bomb in a subway passageway near Times Square, authorities said.