Preparations are well underway in Boca Raton for the third and final US presidential debate on Monday night.

President Barack Obama and Republican presidential nominee Mitt Romney will go head-to-head at Lynn University, in Florida.

Peter Eyre, Senior Advisor to the Commission on Presidential Debates, told the Associated Press on Sunday that "in terms of level of interest, we expect tens of millions of people from around the globe."

Foreign policy is the subject and the 90-minute debate will be divided into six segments of approximately 15 minutes each.

Moderator Bob Schieffer of CBS News will open each segment with a question, and each candidate will have two minutes to respond.

The moderator will use the balance of the time in the segment for a discussion of the topic.

The Commission on Presidential Debates, which sponsors the debates, says the topics could change because of news developments.

Currently, the topics, though not necessarily in this order, are: America's role in the world; Our longest war - Afghanistan and Pakistan; Red Lines - Israel and Iran; The Changing Middle East and the New Face of Terrorism; and The Rise of China and Tomorrow's World.

Landing a presidential debate requires painstaking adherence to a lengthy checklist, not to mention millions of dollars.

Colleges and universities big and small have held the grand events over the years, and Lynn University is the latest small liberal arts school to play host.

Officials say what set them apart wasn't name recognition, but a willingness to transform campus life to pull it off.

The university has invested about five (m) million US dollars in upgrades to prepare for the debate.

New entrances to campus have been built, and the computer network has been upgraded.