Mexican President Felipe Calderon addresses a joint meeting of the U.S. Congress on Thursday. Chip Somodevilla/Getty Images hide caption

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President Obama walks with Afghan President Hamid Karzai at the presidential palace in Kabul on March 28. In recent comments, Karzai has blamed the West for many of his troubles, causing concern in Washington. Charles Dharapak/AP hide caption

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Secretary of State Hillary Clinton addresses the American Israel Public Affairs Committee (AIPAC) policy conference in Washington on Monday. She reiterated U.S. support for Israel but also repeated criticism of Israel's announced plans to build more homes in east Jerusalem, an area that the Palestinians hope will be part of a new Palestinian state. Cliff Owen/AP hide caption

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Israeli police detain a left-wing Israeli activist during a protest Friday in the East Jerusalem neighborhood of Sheikh Jarrah against Israeli settlements and occupation. The protest came after Israel announced controversial plans to build new homes for Jews. Alessio Romenzi/AFP/Getty Images hide caption

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Afghan National Police Col. Shafiqa Quraishi addresses the crowd during the International Women's Day ceremony at the Interior Ministry in Kabul on March 4. Staff Sgt. Larry E. Reid Jr./U.S. Air Force photo courtesy of isafmedia via Flickr hide caption

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U.S. Secretary of State Hillary Clinton and British Foreign Secretary David Miliband (shown here Jan. 21 in Washington, D.C.) will be among the officials meeting in London this week to discuss Afghanistan and Yemen. Joshua Roberts/Getty Images hide caption

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Haiti's President Rene Preval answers questions from the press as Secretary of State Hillary Clinton looks on in Port-au-Prince on Saturday. Preval and Clinton met to discuss the state of emergency after last week's deadly earthquake. Julie Jacobson/AP hide caption

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President Obama speaks from the Rose Garden as George W. Bush and Bill Clinton look on. Obama asked the former presidents to help with U.S. relief efforts in Haiti after the earthquake. Alex Brandon/AP hide caption

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Secretary of State Hillary Clinton listens to remarks by Jordanian Foreign Minister Nasser Judeh after their meeting Friday at the State Department. Tim Sloan/AFP/Getty Images hide caption

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A man talks on his cell phone in Kabul, Afghanistan, in this 2007 photo. As part of its initiative to use technology to address global problems, the State Department is working on better ways to protect mobile phone service in Afghanistan from insurgent attacks. AP hide caption

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A new report by a human rights organization says the current Cuban regime, headed by President Raul Castro, uses an "Orwellian" law to keep dissidents locked up. Adalberto Roque/AFP/Getty Images hide caption

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A U.N. vehicle is seen through the bullet-riddled guardhouse of the Bekhtar Guesthouse in Kabul, Afghanistan, after an attack Wednesday by Taliban suicide gunmen killed six expatriate U.N. staffers. The attack is a recent reminder of the dangers facing civilian workers in Afghanistan. Romeo Gacad/AFP/Getty Images hide caption

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At the inaugural J Street Conference in Washington on Tuesday, National Security Adviser James Jones discussed the Israeli-Palestinian conflict and the role of the U.S. in helping to resolve it. Saul Loeb/AFP/Getty Images hide caption

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