U.S. Sen. Mark Kirk (R-Ill.) was among the 47 Senate Republicans who signed a controversial letter to the leaders of Iran. The letter Kirk signed tells Iran that any agreement it reaches with the Obama administration on its nuclear program will likely be undone by the Republican-controlled Congress. Despite criticism that the letter goes beyond legislators' constitutional role in foreign policy, Kirk says he has no regrets about signing it.

I would say that I've been a lone voice in the wilderness on the Iran issue, Kirk said. It is extremely unlikely that the Iranians will agree with the President. I don't he's going to get his Iranian agreement.


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U.S. Sen. Dick Durbin (D-Ill.) says he was surprised to see Kirk?s signature on the letter. I know he feels intense about this, I know that, and I do too, Durbin said. I don't want to see a nuclear Iran, but now we have negotiations to try and avoid it.

The letter may have an impact on the nuclear negotiations with Iran, which President Obama wants to have wrapped up by the end of the month.

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