The Manchin and Heitkamp resolution would require the Obama administration to more clearly outline its strategy and goals in Syria. The resolution would also give the Assad regime 45 days to sign an international agreement, the Chemical Weapons Convention, a promise that it would not use chemical weapons again.
"If, after 45 days, the Assad regime mistakes our deliberate and careful democratic process for lack of will and immunity, it does so at its own peril," Heitkamp said in a statement.
But one Syria expert warns that the plan and alternatives like it, give Assad too much leverage, time and flexibility to hide or unleash chemicals against his people once again.
"It would be a positive for Assad to sign on, but let's remember there are countries that have signed it and then violated it. That is no guarantee," says Wayne White, a policy expert with the Washington D.C.-based Middle East Policy Council.