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A protester is targeted by a water cannon during clashes with riot police during a demonstration against new working regulations in Brussels, Belgium, Tuesday, May 24, 2016. (AP Photo/Michel Spingler)

Britain's Queen Elizabeth II is pictured through a gap in a floral exhibit by the New Covent Garden Flower Market, which features an image of the Queen, during a visit to the 2016 Chelsea Flower Show in central London on May 23, 2016.Britain has a "lost generation" with no gardening skills, the Royal Horticultural Society warned on Monday, as its sprawling Chelsea Flower Show got under way with an inauguration by Queen Elizabeth II. ADRIAN DENNIS/AFP/Getty Images

U.S. President Barack Obama bows as he visits the Jade Emperor Pagoda with Thich Minh Thong, abbot of the Jade Emperor Pagoda, in Ho Chi Minh City, Vietnam, Tuesday, May 24, 2016. The Jade Emperor Pagoda is one of the most notable and most visited cultural destinations in Ho Chi Minh City. (AP Photo/Carolyn Kaster)

Real Madrid Cristiano Ronaldo plays with a ball during a training session ahead of Saturday's Champions League soccer match final between Atletico de Madrid and Real Madrid, at the Valdebebas stadium in Madrid, Spain, Tuesday, May 24, 2016 . (AP Photo/Daniel Ochoa de Olza)

Spanish bullfighter David Mora is tossed by an Alcurrucen ranch's fighting bull during a bullfight at the Las Ventas bullring in Madrid, Spain, Tuesday, May 24, 2016. (AP Photo/Francisco Seco)

Supporters of nuclear and solar energy rally in the rotunda at the Illinois State Capitol, Tuesday, May 24, 2016, in Springfield, Ill., as lawmakers gathered to talk about the final week of the legislative session. (AP Photo/Seth Perlman)

Women and children separate grain from soil, after the driver of a truck lost control of a vehicle which spilled grain, in the forest in Machinga, about 200 kilometers north east of Blantyre, Malawi, Tuesday, May 24, 2016. Hundreds of villagers thronged the spot and helped themselves to some of the grain. About 2.8 million Malawians - nearly 20 percent of the population - face food insecurity, making the country one of the worst hit in Southern Africa. (AP Photo/Tsvangirayi Mukwazhi)

A migrant carries his belongings during an evacuation operation by police forces of a makeshift migrant camp at the border at the Greek-Macedonian border near the village of Idomeni, on May 24, 2016. In an operation which began shortly after sunrise on May 24, hundreds of Greek police began evacuating the sprawling camp which is currently home to 8,400 refugees and migrants, among them many families with children, an AFP correspondent said. At its height, there were more than 12,000 people crammed into the site, many of them fleeing war, persecution and poverty in the Middle East and Asia, with the camp exploding in size since Balkan states began closing their borders in mid February in a bid to stem the human tide seeking passage to northern Europe. YANNIS KOLESIDIS/AFP/Getty Images

Bill Cosby waves as he leaves the Montgomery County Courthouse after a preliminary hearing, Tuesday, May 24, 2016, in Norristown, Pa. Cosby was ordered to stand trial on sexual assault charges after a hearing that hinged on a decade-old police report. (AP Photo/Matt Slocum)