US President Bill Clinton (L) gestures during a speech on health care reform at the White House as Senator Edward Kennedy (D-Mass) looks on, in this July 13, 1999 file photo. [Agencies]

US President Bill Clinton (R) and Senator Edward Kennedy sit under an umbrella during ground breaking ceremonies for a monument to non-violence in memory of Robert Kennedy and Dr. Martin Luther King Jr. in this May 14, 1994 file photo. [Agencies]