This is the second time the administration has faced questions about chemical weapons use in Syria . NEW : White House wo n't rule out more help for rebels , has n't verified latest claim on chem weapons . Comment: Syrian opposition groups do n't trust the Obama administration , experts on the region say . Distrust stems from the U.S. debate over chemical weapons , likely to reignited after latest claims .
NEW : White House wo n't rule out more help for rebels , has n't verified latest claim on chem weapons . Comment: Syrian opposition groups do n't trust the Obama administration , experts on the region say . Distrust stems from the U.S. debate over chemical weapons , likely to reignited after latest claims .