US President Barack Obama and Republican rival Mitt Romney confront each other on foreign policy tonight in a third and final presidential debate.
The must-win televised face-off comes as the deadlocked campaign for the White House heads into its final two weeks.
Polls show Mr Obama with an advantage in voter perceptions about which candidate would do best in foreign affairs, but Mr Romney is expected to use the head-to-head meeting in Florida, to whittle away the president's edge.
He has been hitting Mr Obama, above, hard on the administration's uncertain explanations about what happened in last month's attack on the US Consulate in Benghazi, Libya.
Militants killed four Americans, including US Ambassador Chris Stevens.
Iran-Israel tensions, China, terrorism and the war in Afghanistan were all subjects expected to come up in the 90-minute debate moderated by CBS News' Bob Schieffer.
Against the background of the debate, 41 of the 50 US states are essentially already decided, and the candidates now are fighting to win in the remaining nine battleground states, including critical Ohio and Florida.
A new NBC News/Wall Street Journal poll released yesterday showed Mr Obama and Mr Romney tied on 47pc of likely voters nationwide.