Donald Trump, the front-runner for the Republican presidential nomination, gave an outline of his worldview and foreign policy goals in an address in Washington Wednesday. Evan Vucci/AP hide caption

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In 2014 photo, demonstrators chant pro-ISIS slogans in front of the provincial government headquarters in Mosul, Iraq. AP hide caption

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Fact Check: Did Obama Withdraw From Iraq Too Soon, Allowing ISIS To Grow?
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Debate: Is A Containment Strategy Enough For Isis?
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An engraving of the assassination of President Abraham Lincoln at Ford's Theatre in Washington on April 14, 1865. Lincoln died the next day. De Agostini Picture Library/De Agostini/Getty Images hide caption

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President Obama with Israeli Prime Minister Benjamin Netanyahu at the White House in 2013. The two have never had a warm and fuzzy relationship. Charles Dharapak/AP hide caption

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Bad Blood Gets Worse Between Barack, Bibi And Israel
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Josef Joffe, author of The Myth of America's Decline, says the U.S. remains a world leader in education, economic performance and innovation. Samuel LaHoz/Intelligence Squared U.S. hide caption

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Debate: Are America's Best Days Behind It?
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