President Obama has asked for congressional support to use limited military strikes against Syrian President Bashar Assad, who used chemical weapons against his own people. Videos of chemical weapons attacks near Damascus have been released.

Obama will address the nation Tuesday evening as new possibilities about a negotiated settlement with Syria seem likely to slow congressional action.

On Monday, Russia suggested an agreement under which Syria would give up control of its chemical weapons, and Syria indicated it could agree to this solution. That prompted Obama to acknowledge that this sort of agreement could allow Syria to dodge a U.S. attack.

Boxer said she’d prefer a “peaceful” solution, but said doing nothing was not an option.

“There is no way that our national security is unaffected when these weapons are used and no one is held accountable,” Boxer said. “If we stand by and do nothing what message do we send to these people with chemical weapons?”

The Senate Foreign Relations Committee approved a resolution last week that would give Obama 60 days to make limited military strikes against Syria in an effort to degrade Assad's chemical weapon stockpile. But lawmakers are now working on a new resolution that would authorize military action only if Syria refuses to relinquish its stockpile of chemical weapons to international control.