President Obama meets with Emory University doctors and health care workers during his visit Tuesday to the Centers for Disease Control and Prevention in Atlanta. Mandel Ngan/AFP/Getty Images hide caption

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A health worker speaks with families in a classroom now used as Ebola isolation ward in Monrovia, Liberia. Ebola-stricken West Africa needs more health staff and more medical facilities. John Moore/Getty Images hide caption

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British Prime Minister David Cameron told the House of Commons on Monday that he wants to give police the power to seize the passports of Islamist fighters bound for Iraq and Syria. PA Photos /Landov hide caption

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President Obama speaks during a press conference at the White House on Monday about the situation in Iraq and the ongoing violence in Ferguson, Mo. Win McNamee/Getty Images hide caption

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Immigrants from Honduras and El Salvador who crossed the U.S.-Mexico border illegally are stopped in Granjeno, Texas, on June 25. President Obama asked Congress this week for $3.7 billion to cope with thousands of minors from Central America who are illegally crossing the U.S. border. Eric Gay/AP hide caption

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Detainees sleep in a holding cell at a U.S. Customs and Border Protection processing facility in Brownsville, Texas, on June 18. The White House on Tuesday sought $3.7 billion to deal with the immigration crisis at the border. Eric Gay/AP hide caption

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President Obama ruled out sending ground troops to Iraq, saying any U.S. action must be accompanied by Iraqi political action. Kevin Lamarque/Reuters /Landov hide caption

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