US lawmakers step up calls for Congress to back Obama's war on ISIS

U.S. lawmakers on Sunday stepped up calls for congressional authorization of President Barack Obama's war against Islamic State militants in Iraq and Syria, amid signs the United States and its allies face a long and difficult fight. U.S. House Speaker John Boehner told ABC's "This Week" that he believed Obama had the legal authority for strikes against Islamic State, but would call lawmakers back from their districts if Obama sought a resolution backing the action.

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