U.S. President Barack Obama hugs Shigeaki Mori, an atomic bomb survivor, during a ceremony Friday, May 27, at Hiroshima Peace Memorial Park in Hiroshima, Japan. Obama became the first sitting U.S. president to visit the site of the world's first atomic bomb attack. Mori worked for four decades to gain official recognition of the 12 Americans killed in the bombing.
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Donald Trump speaks in Bismarck, North Dakota, after reaching the threshold of delegates he needed to clinch the Republican Party's presidential nomination on Thursday, May 26. Trump will not formally accept the nomination until the delegates cast their votes on the convention floor in July.
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Shirtless men cheer for Democratic presidential candidate Hillary Clinton at a campaign event in Buena Park, California, on Wednesday, May 25.
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U.S. Secretary of State John Kerry acknowledges the crowd as he arrives for President Barack Obama's town-hall event in Ho Chi Minh, City, Vietnam, on Wednesday, May 25. See more photos of Obama's trip to Vietnam and Japan
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A mural in Bristol, England, shows London Mayor Boris Johnson, right, kissing U.S. presidential candidate Donald Trump on Monday, May 23. Local artists created the mural to urge young people to register to vote. Britain is facing its biggest political decision in decades: Remain a member of the European Union, or walk away from the world's largest single market?
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U.S. Sen. Cory Booker sits on the floor with eighth-graders visiting the Hart Senate Office Building in Washington on Tuesday, May 24.
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A person wears a Bernie Sanders shirt after the U.S. senator and presidential candidate spoke at a rally in Cathedral City, California, on Wednesday, May 25.
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U.S. Rep. Debbie Wasserman Schultz, chairwoman of the Democratic National Committee, walks down the Capitol steps on Thursday, May 26. Wasserman Schultz is on increasingly thin ice as she risks losing key support to stay in her job as DNC chairwoman.
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Democratic presidential candidate Hillary Clinton arrives at a rally in Riverside, California, on Tuesday, May 24.
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U.S. Sen. John McCain talks on his phone as he steps off the Senate floor in Washington on Wednesday, May 25.
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Sheriff's deputies arrest a protester near the convention center in Anaheim, California, on Wednesday, May 25. Republican presidential candidate Donald Trump was holding a rally at the convention center.
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World leaders walk together for a photo session Thursday, May 26, on the first day of G7 summit meetings in Shima, Japan. From left are Italian Prime Minister Matteo Renzi, German Chancellor Angela Merkel, Japanese Prime Minister Shinzo Abe, Canadian Prime Minister Justin Trudeau, U.S. President Barack Obama and British Prime Minister David Cameron.
Japan Pool/AP
Television camera operators work from a platform as Democratic presidential candidate Hillary Clinton attends a rally in San Francisco on Thursday, May 26.
John Locher/AP
U.S. Rep. Bill Pascrell, left, competes in the fourth annual Congressional Bocce Ball Tournament on Monday, May 23. Pascrell and his partner, U.S. Rep. Pat Tiberi, center, defeated a team from Xerox in an event sponsored by the National Italian American Foundation.
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Colorado Gov. John Hickenlooper shows off his socks -- one with Democratic presidential candidate Bernie Sanders, left, and the other with Republican candidate Donald Trump -- before signing copies of his autobiography in Denver on Thursday, May 26.
