Former President Obama on Tuesday marked the 17th anniversary of the Sept. 11, 2001, terrorist attacks, paying tribute to all the victims and first responders.

"We will always remember everyone we lost on 9/11, thank the first responders who keep us safe, and honor all who defend our country and the ideals that bind us together," Obama tweeted.

"There's nothing our resilience and resolve can’t overcome, and no act of terror can ever change who we are."

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His tweet comes as ceremonies and memorials throughout the country on Tuesday will mark the anniversary of the al Qaeda terrorist attacks, which caused nearly 3,000 deaths.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE is set to take part in a morning ceremony at the memorial in Shanksville, Pa., the location where United Airlines Flight 93 crash-landed after a group of passengers stopped the hijacked plane, which was intended for the Capitol.

Senate Minority Leader Charles Schumer (D-N.Y.) is scheduled to appear at a ceremony at the World Trade Center site in New York City.