Mr. Biden will join three other living presidents at the event. President Trump has decided to skip the ceremony and is expected to appear at the Pentagon on the 25th anniversary of the attacks.
Former President Joseph R. Biden Jr. and the former first lady Jill Biden will attend a ceremony in New York commemorating the Sept. 11 terrorist attacks.
President Trump originally intended to commemorate the 25th anniversary of Sept. 11 with remarks at ground zero, but the memorial’s organizers do not allow speeches. Mr. Trump changed his plans.