* President Joe Biden arrived at Ground Zero Saturday to mark the 20th anniversary of the 9/11 terror attacks
* He was joined by President Barack Obama and Bill Clinton and former first ladies Michelle Obama and ex-Secretary of State Hillary Clinton
* House Speaker Nancy Pelosi and Senate Majority Leader Chuck Schumer, along with other public officials, were on hand
* Former New York City Mayor Rudy Giuliani attended - with former President Donald Trump expected to make a solo trip to the Manhattan site
* Biden didn't speak at the ceremony in New York, releasing a video tribute Friday
* Later, Biden will travel to Shanksville, Pennsylvania and then the Pentagon - where he'll lay wreaths at the other two sites Americans perished on 9/11
* Former President George W. Bush, who was president during the attacks, delivered remarks in Shanksville condemning 'violent extremists abroad and violent extremists at home'
President Joe Biden and First Lady Jill Biden visited all three sites Saturday where terrorists killed Americans on September 11, 2001, marking the 20th anniversary of the attacks.
The Bidens woke up in New York and joined the Clintons and the Obamas at a ceremony at Ground Zero, before traveling to Shanksville, Pennsylvania and then the Pentagon for wreath-laying services.
'These memorials are really important. But they’re also incredibly difficult for the people affected by them, because it brings back the moment they got the phone call, it brings back the instant they got the news, no matter how years go by,' Biden told reporters in Pennsylvania.
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WNU Editor: A difficult day for many.