WASHINGTON - The "great threat" to Israel from the Syrian conflict is that the Damascus government may collapse and its stock of chemical weapons and missiles fall into the hands of the Lebanese Islamist group Hezbollah, Israeli Prime Minister Benjamin Netanyahu said on Sunday. Interviewed on the U.S. "Fox News Sunday" television program, Netanyahu said Syrian President Bashar al-Assad's government would fall, but he was more concerned about a chaotic "regime collapse" that would leave Syria's weapons sites unguarded than a regime change. "We certainly don't want to be exposed to chemical weapons falling into the hands of Hezbollah or some other terror groups. ... It's a great threat," he said. "We will have to consider our action. Do I seek action? No. Do I preclude it? No," Netanyahu said when asked whether Israel would act alone or prefer the United States to take the lead. US Senator John McCain said that in addition to the Israeli concerns, there was a risk that the Syrian government might use chemical weapons against its opponents. " These are helicopter gunships, tanks, artillery that are slaughtering people, and now there is a risk - and I'm not saying it is going to happen - a risk that in his desperation, Bashar al-Assad might use those chemical weapons," M cCain, the 2008 Republican presidential nominee, said on CNN ' s "State of the Union with Candy Crowley". Israeli Defense Minister Ehud Barak said on Friday that Israel would consider taking military action if needed to ensure Syrian missiles or chemical weapons do not reach Hezbollah. Hezbollah, which in the past has received military and financial support from Syria and Iran, launched thousands of mainly short-range rockets into Israel during the Jewish state's 2006 offensive in southern Lebanon.