(CBS News) LONDON - Secretary of State John Kerry continued his effort in London Sunday to build international support for U.S. air strikes on Syria, hoping to reel in more Arab support after Saudi Arabia endorsed U.S.-led action.
Kerry dismissed Syrian President Bashar Assad's denials that he usedand said "the evidence speaks for itself." Earlier in Paris, he made the case to Arab leaders.
"He has one of the largest stocks of chemical weapons in the world," Kerry said. "And at the moment, he has no intention of really negotiating. So it is certain that if he's threatened, he will use them again."
Kerry said that Saudi Arabia is supportive of a U.S-led strike and was convinced Assad was behind the chemical attack -- and he expects other Arab countries to issue statements of support within the next 24 hours.
But few are expected to say they will join in a military strike.
Kerry got aSaturday, which urged the world to send "a clear and strong response," but asked the US to delay any action until the U.N. weapons inspectors .
One of the biggest challenges for Kerry has been convincing American allies to back a plan that has still not been approved by Congress.
That is why, Kerry explained, the Obama administration released graphic videos of the chemical weapons attack in an effort to persuade members of the House and Senate who may doubt that the attack in Syria poses a national security threat.