Watch part two 

Iran's 46 million voters go to the polls on Friday to choose their next president.

Will the incumbent, Mahmoud Ahmadinejad, remain in office or be pushed out by one of three other contenders?

Mir Hossein Mousavi, the former prime minister is running a close race and has surged in popularity during the two-week official campaign period – but will it be enough for him to win?

What are the issues facing the country? And what is at stake for the rest of the world?

On Thursday, Riz discusses the potential scenarios with Hooman Majd, president Ahmadinejad's former translator and author of the book, "The Ayatollah Begs To Differ."

This episode of the Riz Khan show aired on Thursday, June 11, 2009.