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US President Barack Obama (C) is flanked by HHS Secretary Sylvia Mathews Burwell (L) and National Security Advisor Susan Rice, while meeting with his national security and public health teams in the Roosevelt Room at the White House, November 4, 2014 in Washington, DC.
US President Barack Obama (C) is flanked by HHS Secretary Sylvia Mathews Burwell (L) and National Security Advisor Susan Rice, while meeting with his national security and public health teams in the Roosevelt Room at the White House, November 4, 2014 in Washington, DC.

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    White House hosts summit on extremism

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White House hosts summit on extremism

With ISIS' propaganda spreading across the world, the United States is scrambling to counter the terrorist group's message. CNN's Jim Acosta has more.

White House hosts summit on extremism

With ISIS' propaganda spreading across the world, the United States is scrambling to counter the terrorist group's message. CNN's Jim Acosta has more.