WASHINGTON » 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.

The senators working on the proposal are Republicans John McCain, Kelly Ayotte, Lindsey Graham and Saxby Chambliss along with Democrats Chris Coons, Bob Casey, Chuck Schumer, Carl Levin and Bob Menendez.

The aides spoke on condition of anonymity because they weren’t authorized to publicly discuss the plan.