Obama in speech to nation vows to defeat 'new phase' of terrorist threat

By Matt Spetalnick, Roberta Rampton and Jeff Mason WASHINGTON (Reuters) - President Barack Obama warned Americans on Sunday the terrorist threat to the United States had evolved into a dangerous "new phase" in the aftermath of a deadly California shooting rampage, but vowed to destroy Islamic State and other militant groups. In a rare Oval Office address, Obama sought to calm a U.S. public increasingly jittery about the fight against Islamist militancy that once appeared to be waged overseas. Instead, in a measured way, Obama drew a careful line about what he would and would not do.
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