Asif Zardari was accompanied by Pakistan Peoples Party (PPP) Senators A. Rehman Malik and Sherry Rehman, said a press release issued here on Thursday.
While addressing the event, former president, said that he is pleased to be here to witness the transition of power.
He said that Pakistan Peoples Party delegation was feeling honour to be the guest and participant of these moments.
Large number of U.S Senators, Congressmen, Republican members and dignitaries attended the event.