He added, "I've said the president has the authority to act but the Congress is going to do what's right here."

Congressional approval is not a foregone conclusion. Sen. Rand Paul (R-Ky.) said on Meet the Press, "I think it's a mistake to get involved in the Syrian civil war."

He said that he thought the Senate would "rubberstamp what he wants" but that "I think it's at least 50-50 whether the House will vote down involvement in the Syrian war."

On the CBS News program Face the Nation, Sen. John McCain (R-Ariz.) said, "We need to have a strategy and a plan" to keep military action from being simply a symbolic gesture.

But Sen. Tim Kaine (D-Va.) said on Face the Nation, "I am confident that Congress will rally behind the important principle that the use of chemical weapons, violating an international norm that's been in place since the 1920s, is unacceptable and that we need to engage in action, even military action, with international allies to stop it."

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