President Obama has witnessed the return of the bodies of US Ambassador Chris Stevens and three embassy staff members killed in the attack on the US consulate in Benghazi, Libya.
The four coffins, draped in the stars and stripes, were carried off a plane at the Andrews Air Force Base in Maryland and placed in waiting hearses.
The President is due to make an address at the ceremony.
President Obama vowed to do everything possible to protect Americans overseas as he honoured the four killed in the Libyan consulate attack.
Both Barack Obama and Mitt Romney know how they respond to the spread of violence across the Arab world could affect their election hopes.
Mitt Romney has attempted to score cheap, tawdry political points in the wake of the worst attack on the US diplomatic service in decades.