The plan suggests limits on gases blamed for global warming.

Ex-defense chiefs would have advised against going to Congress.

Tense negotiations have begun on a proposed U.N. resolution that would end a diplomatic stalemate.

The president and others assembled on the White House lawn and bowed their heads to observe a moment of silence.

Asked congressional leaders to delay a vote on a resolution authorizing limited military strikes.

Wary of falling into what the French foreign minister called "a trap," Paris and Washington are pushing for a U.N. Security Council resolution to verify disarmament.

The development has the potential to blunt a thorny diplomatic problem.

In a rapid and remarkable chain of events, Syria welcomed the idea of turning over all of its chemical weapons for destruction, and the U.S. president said such an action could head off the threats of air strikes.

President concedes an intervention would be unpopular, declines to indicate what he'll do if plan is rejected.

White House asserted Sunday that a "common-sense test" dictates the Syrian government is responsible for a chemical weapons attack that President Barack Obama says demands a U.S. military response.