President Biden, along with former President Obama and Clinton, attended the 9/11 remembrance ceremony at Ground Zero in New York, the site of the two World Trade Center towers attacked in 2001 that has been developed into a memorial. Former President George W. Bush, who was commander in chief during the 2001 terrorist attacks, will deliver keynote remarks on Saturday morning at the Flight 93 National Memorial in Shanksville, Pennsylvania. #september11 #911Memorial #neverforget 📷 Chip Somodevilla @gettyimages