The White House says it plans to share the findings with Congress and U.S. allies . Sen. John McCain says the rebels need anti-tank and anti-aircraft weapons . Syria has crossed a `` red line '' with its use of chemical weapons , including the nerve agent sarin gas , against rebels , a move that is prompting the United States to increase the `` scale and scope '' of its support for the opposition , the White House said Thursday . Obama calls for more support from Arab nations in Syria fight. The United States plans to step up its military support of the rebels , the White House says .
The White House says it plans to share the findings with Congress and U.S. allies . Sen. John McCain says the rebels need anti-tank and anti-aircraft weapons . Obama calls for more support from Arab nations in Syria fight. The United States plans to step up its military support of the rebels , the White House says .