The White House announced that attendees for the president’s remarks at the Pentagon’s 9/11 National Memorial include “family members of the fallen, first responders, representatives from first response teams and Defense Department leadership.” Biden said earlier Sunday morning that he has “a plan” for the families of the victims who died in the Sept. 11, 2001, terrorist attacks. Answering questions from reporters before boarding Air Force One to travel from Delaware to Washington, Biden, when asked if he had a plan to deal with the families of 9/11 victims who want justice after the terrorist attacks, said: “Yes. , there is a plan for that,” without elaborating. Vice President Kamala Harris, meanwhile, met with family members who lost loved ones in the 9/11 attacks after arriving at the National 9/11 Memorial in New York. Harris, who is attending a memorial service at Ground Zero, also met with first responders, according to a White House official. And first lady Jill Biden will deliver remarks at a 9/11 memorial service in Shanksville, Pennsylvania, on Sunday morning. The first lady will be joined by her sister, Bonny Jacobs, her communications director Elizabeth Alexander told CNN. Jacobs is a flight attendant for United Airlines. Nearly 3,000 people were killed in the attacks, which were orchestrated by al-Qaeda leader Osama bin Laden. Airliners crashed into the World Trade Center in New York, the Pentagon in Arlington, Virginia, and a field near Shanksville, Pennsylvania. This story has been updated with additional developments. CNN’s Kate Bennett, Nikki Carvajal and Aaron Pellish contributed to this report.