Without a negotiated solution over the Iranian nuclear program, 2013 will likely see a military confrontation with Iran, Former US Ambassador to Israel Martin Indyk said on CBS's "Face the Nation" Sunday.

"There is still time, perhaps six months, even by Prime Minister Netanyahu's own time table to try to see if a negotiated solution can be worked out," Indyk said on the morning news show. "I'm pessimistic about that. If that doesn't work out -- and we need to make every effort, exhaust every chance that it does work -- then I am afraid that 2013 is going to be a year in which we're going to have a military confrontation with Iran."

In recent weeks, rhetoric over the possibility of a military strike against Iran ballooned as Prime Minister Binyamin Netanyahu demanded that the US set "red lines" for Iran on its progressing nuclear program, and US President Barack Obama refused.

"While there's still time, there is not a lot of time, and I don't think the difference between Netanyahu and Obama on this is that great in terms of the President's commitment not to allow Iran to acquire nuclear weapons," said Indyk, who served as US Ambassador to Israel twice and is currently Director for Foreign Policy at the Brookings Institution in Washington.

"The idea of putting out a public red line, in effect, issuing an ultimatum, is something that no president would do. You noticed Governor Romney is not putting out a red line. Senator McCain didn't either, and neither is Bibi Netanyahu for that matter in terms of Israel's own actions because it locks you in," he said.

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