WASHINGTON (AP) — Senior congressional aides say a bipartisan group of senators is working on an alternative measure to a resolution authorizing U.S. military force against Syria.

The group met late Monday on a plan that would call on the U.N. Security Council to state that Syria has chemical weapons and require a U.N. team to remove them within a specific time period, possibly 60 days. If this cannot be done, then President Barack Obama would have the authority to launch military strikes.