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US President Barack Obama gestures as he speaks at the University of Queensland on the sidelines of the G20 Summit in Brisbane on November 15, 2014. Australia is hosting the leaders of the world's 20 biggest economies for the G20 summit in Brisbane on November 15 and 16. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US President Barack Obama gestures as he speaks at the University of Queensland on the sidelines of the G20 Summit in Brisbane on November 15, 2014. Australia is hosting the leaders of the world's 20 biggest economies for the G20 summit in Brisbane on November 15 and 16. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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As President Obama prepares to unveil his immigration plan, Tom Foreman explains what an "executive action" really is.