On GPS Sunday: One-on-ones with Rouhani and Peres, and how to contain Ebola

Watch "Fareed Zakaria GPS," Sundays at 10 a.m. and 1 p.m. ET on CNN

On GPS this Sunday: The leaders of the world gathered this week in New York for the U.N. General Assembly meeting, and GPS gathered some of the most interesting voices to get their takes on current events.

First, Fareed speaks with Iranian President Hassan Rouhani about the threat posed by the Islamic State of Iraq and Syria, the state of the nuclear talks, and the harsh judgment handed down against six Iranians who made a "happy" video.

“Iran, from the very first moment, did not hesitate in fighting against terrorism,” Rouhani says. “Other countries apparently had their doubts for quite some time.  They were under the impression that, be it as it may, they acted quite late in the game.”

Next, Fareed sits down with a man who decades has worked at the highest levels of Israel’s government. Shimon Peres discusses the prospects for peace in the Middle East...and why at age 91 he's considering a new career – including delivering pizza.

Also, the Ebola outbreak – 1.4 million infections are possible says the CDC...and that's by January, in just two nations. What could be done to contain the crisis? Fareed puts that question to Chelsea Clinton, Paul Farmer, and Liberia's foreign minister.