But many were not specific about what that action might be taken.
President Obama has warned that Syria's use of chemical weapons would be a "red line," raising the possibility of military intervention to secure the country's large stockpile.
Sen. Dianne Feinstein (D-Calif.), chairwoman of the
In light of the White House accusation, "I am very concerned that ... President Assad may calculate he has nothing more to lose, and the likelihood he will further escalate this conflict therefore increases," Feinstein said.
"Syria has the ability to kill tens of thousands with its chemical weapons," she added. "The world must come together to prevent this by unified action which results in the secure containment of Syria's significant stockpile of chemical weapons."
"The administration has said it's a game changer, but it's not clear what that new game will look like," he said. "I think it is incumbent on the international community to take strong action."
The White House is deeply reluctant to become embroiled in the Syrian conflict. But Defense Secretary
"It violates every convention of warfare," Hagel said. "Most people in the world, most leaders put the use of chemical weapons in a different category."
"It requires United States assistance; it does not mean boots on the ground," he told reporters.