The United Nations says the number of refugees from the escalating crisis in Syria has reached 2 million.
Later Tuesday, the Obama administration will send two of its heaviest hitters to Capitol Hill to rally for action abroad, CNN's Brianna Keilar reports.
Secretary of State John Kerry and Defense Secretary Chuck Hagel will testify before the Senate Foreign Relations Committee in a closed door session.
McCain says "We want to work to make that resolution something that the majority of both Houses can support," but adds "we still have significant concerns."
Graham stresses, "We don't want endless war."
Congress wants a limited strike and no boots on the ground.
And some of these officials may soon be lobbied from a much different direction.
Russia, a friend of the Syrian government, says it will send some of its representatives to meet with members of Congress.
Foreign Minister Sergei Lavrov has questioned if chemical weapons were used at all saying, there's "nothing concrete, no names and no proof."