stance that "all options" for dealing with Iran are on the table.

Even if a deal is reached, he said the West still has "a whole bunch" of problems with Iran, including state-sponsored terrorism, Iran's rhetoric toward Israel and financing of Hezbollah, as well as differences over Syria.

The U.S., Britain and four other world powers - China, France, Germany and Russia - are trying to reach a final deal on Iran's nuclear program by a July 1 deadline. The talks were extended after a November deadline was missed.

Obama said he still maintains that the chance of a diplomatic agreement is probably less than 50 percent.

Earlier in Paris, U.S. Secretary of State John Kerry met with his Iranian counterpart Javad Zarif for talks on Tehran's nuclear program, after discussions onthe issue earlier this week in Geneva. A State Department official said Kerry met with Zarif in Paris for approximately an hour and that they agreed to stay in touch and plan to meet again in the coming weeks.

Kerry was in Paris to honor the victims of last week's terror attacks

The so-called P5 plus 1 countries want Iran to scale back its uranium enrichment program to keep it from being able to build a nuclear bomb. In exchange, sanctions against Iran would be lifted.

The United States, its European allies and the United Nations have already imposed a series of sanctions on Iran aimed at getting it to curb nuclear activities that could be used to build a nuclear bomb. Iran insists on a right to enrich uranium but