Obama v Romney: US rivals poised for final clash
The stage is set for the final Obama versus Romney debate.
With just two weeks to go till the US election, the candidates will meet in front of a live audience at a university in Florida.
Opinion polls suggest Barack Obama and his Republican challenger Mitt Romney are neck and neck.
Tonight's discussions are expected to focus on foreign policy issues including Libya and Iran.
The BBC's North America editor, Mark Mardell reports.