U.S. President Barack Obama says he believes the chances for a successful final nuclear agreement with Iran are 50/50 or worse.
However, the U.S. leader on Saturday continued to defend diplomacy as the best way to prevent Tehran from acquiring atomic weapons.
President Obama, speaking at the Saban Forum in Washington, sought to reassure critics that the latest deal will stop Iran from advancing its nuclear program for the next six months.
Mr. Obama said the odds of a diplomatic resolution to Iran's nuclear program are probably greater than could be achieved through any other options.
At the same forum dealing with Middle East policy, U.S. Secretary of State John Kerry agreed with the president, saying diplomacy is the best way to resolve the nuclear dispute with Iran.
Israeli Prime Minister Benjamin Netanyahu, who has called the nuclear agreement "the deal of the century" for Iran, speaks to the forum Sunday.