Seeking re-election, President Barack Obama is preparing to clash with his Republican rival Mitt Romney over foreign policy issues like Libya, Iran’s nuclear weapons programme, China and situation in the Af-Pak region in their last US presidential debate before the polls.

Unlike the second debate in New York wherein the questions were asked by a select group of audience, at Boca Raton in Florida, the moderator Bob Schieffer of CBS news would be asking questions in a structured format.

The European financial crisis, the administration’s “reset” strategy with Russia, the US relationship with emerging powers such as India and Brazil, might also jump in during the 90-minute prime-time debate.

Obama is expected to list some of his key achievements of his foreign policy including the killing of Osama bin Laden and end of war in Iraq.

Romney, 65, on the other hand is expected to corner Obama on the terrorist attack on the US Consulate in Benghazi that killed its Ambassador to Libya, the rise of China, the reset-policy with Russia, and the nuclear programme of Iran.