US politics

An attendee wears socks in support of Hillary Clinton, former Secretary of State and presumptive Democratic presidential nominee, not pictured, ahead of a campaign event in Cincinnati, Ohio, U.S., on Monday, June 27, 2016. Clinton released a new national television ad on Sunday attacking likely Republican rival Donald Trump for his comments on the U.K's decision to leave the European Union, and later warned of the negative impact that "bombastic" behavior can have at times of crisis

Ty Wright/Bloomberg

An attendee wears socks in support of Hillary Clinton, former Secretary of State and presumptive Democratic presidential nominee, not pictured, ahead of a campaign event in Cincinnati, Ohio, U.S.

Republican presidential candidate Donald Trump waves as he arrives at his Turnberry golf course, in Turnberry, Scotland, Britain June 24, 2016.      REUTERS/Clodagh Kilcoyne

Clodagh Kilcoyne/Reuters

Republican presidential candidate Donald Trump waves as he arrives at his Turnberry golf course, in Turnberry, Scotland, Britain

A well-wisher holding a banner touches the hearse carrying the remains of Muhammad Ali during the funeral procession for the three-time heavyweight boxing champion in Louisville, Kentucky, U.S., June 10, 2016.   REUTERS/Adrees Latif

Adrees Latif/Reuters

A well-wisher holding a banner touches the hearse carrying the remains of Muhammad Ali during the funeral procession for the three-time heavyweight boxing champion in Louisville, Kentucky, U.S

WASHINGTON, DC - JUNE 09: (EDITORS NOTE: Retransmission with alternate crop.)   Democratic presidential candidate Sen. Bernie Sanders (D-VT) (L) walks with President Barack Obama (R) through the Colonnade as he arrives at the White House for an Oval Office meeting June 9, 2016 in Washington, DC. Sanders met with President Obama after Hillary Clinton has clinched the Democratic nomination for president. (Photo by Alex Wong/Getty Images)

Alex Wong/Getty

Democratic presidential candidate Sen. Bernie Sanders walks with President Barack Obama through the Colonnade as he arrives at the White House for an Oval Office. Sanders met with President Obama after Hillary Clinton has clinched the Democratic nomination for president

SANTA MONICA, CA - JUNE 07: A man holds a sign at the California primary election night rally for Democratic presidential candidate Senator Bernie Sanders (D-VT) on June 7, 2016 in Santa Monica, California. Hillary Clinton held an early lead in today's California primary.  (Photo by David McNew/Getty Images)

David McNew/Getty

A man holds a sign at the California primary election night rally for Democratic presidential candidate Senator Bernie Sanders (D-VT) in Santa Monica, California

TOPSHOT - US First Lady Michelle Obama cheers during the White House Turnaround Arts Talent Show at the White House May 25, 2016 in Washington, DC.  Students from throughout the US performed at the presidential mansion showcasing the power of arts education.  / AFP PHOTO / Brendan SmialowskiBRENDAN SMIALOWSKI/AFP/Getty Images

Brendan Smialowski/AFP/Getty

US First Lady Michelle Obama cheers during the White House Turnaround Arts Talent Show at the White House in Washington D.C. Students from throughout the US performed at the presidential mansion showcasing the power of arts education 

Orange County Sheriff's deputies take a protester into custody outside the Anaheim Convention Center where Republican presidential candidate Donald Trump held a rally

Jae C. Hong

Orange County Sheriff’s deputies take a protester into custody outside the Anaheim Convention Center where Republican presidential candidate Donald Trump held a rally

A U.S. Capitol Police officer humorously reacts to Code Pink for Peace activist Medea Benjamin's protest sign

Chip Somodevilla/Getty Images

A U.S. Capitol Police officer reacts to a Code Pink for Peace activist’s protest sign

Supporter Raena Fisk of Orange County sleeps on the floor in reindeer pajamas after arriving before 5 AM to attend a morning rally for U.S. Democratic presidential candidate Bernie Sanders in Anaheim, California, U.S., May 24, 2016. REUTERS/Mike Blake

Mike Blake/Reuters

Supporter Raena Fisk of Orange County sleeps on the floor in reindeer pajamas after arriving before 5 AM to attend a morning rally for U.S. Democratic presidential candidate Bernie Sanders in Anaheim, California.

TOPSHOT - US Democratic presidential candidate Bernie Sanders speaks during a rally at Santa Monica High School Football Field in Santa Monica, California, on May 23, 2016. Democratic presidential frontrunner Hillary Clinton on May 23 rejected an invitation to take part in a final campaign debate against her rival Bernie Sanders, her campaign said. / AFP PHOTO / Ringo ChiuRINGO CHIU/AFP/Getty Images

Ringo Chiu/AFP/Getty

Democratic presidential candidate Bernie Sanders speaks during a rally at Santa Monica High School Football Field in Santa Monica, California

Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks during a campaign event in Carson, California, U.S., on Tuesday, May 17, 2016. Sanders won the Democratic presidential primary in Oregon Tuesday while Hillary Clinton claimed victory in a closely fought contest in Kentucky, a split decision that will do little to change the nomination race but may delay the party from focusing on the general election. Photographer: Patrick T. Fallon/Bloomberg *** Local Caption *** Bernie Sanders

Patrick T. Fallon/Bloomberg

Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, speaks during a campaign event in Carson, California 

People walk past a mural on a restaurant wall depicting US  Presidential hopeful Donald Trump and Russian President Vladimir Putin greeting each other with a kiss in the Lithuanian capital Vilnius

Petras Malukas/AFP

People walk past a mural on a restaurant wall depicting US Presidential hopeful Donald Trump and Russian President Vladimir Putin greeting each other with a kiss in the Lithuanian capital Vilnius 

Presidential Candidate Bernie Sanders Holds Atlantic City Campaign Rally...An attendee with a campaign sticker on her phone takes video as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, speaks during a rally at Boardwalk Hall in Atlantic City, New Jersey, U.S., on Monday, May 9, 2016. Atlantic City, the struggling casino hub weeks away from bankruptcy absent state action that has been hit hard by the decline of its dominant industry, is a fitting platform for Sanders populist message on how corporations reap profits while urban areas are neglected. Photographer: Andrew Harrer/Bloomberg

Andrew Harrer/Bloomberg

An attendee with a campaign sticker on her phone takes video as Senator Bernie Sanders as he speaks during a rally at Boardwalk Hall in Atlantic City, New Jersey

Republican presidential candidate Donald Trump and his wife Melania Trump arrive to speak to supporters at Trump Tower in Manhattan following his victory in the Indiana primary

Spencer Platt/Getty Images

Republican presidential candidate Donald Trump and his wife Melania Trump arrive to speak to supporters at Trump Tower in Manhattan following his victory in the Indiana primary

With his family by his side, Republican presidential candidate Sen. Ted Cruz (R-TX) speaks during his election night watch party at the Crowne Plaza Downtown Union Station where he announced he was suspending his bid for the Republican presidential nomination

Scott Olson/Getty Images

With his family by his side, Republican presidential candidate Sen. Ted Cruz (R-TX) speaks during his election night watch party at the Crowne Plaza Downtown Union Station where he announced he was suspending his bid for the Republican presidential nomination

Sheriffs on horseback and police break up a group of demonstrators outside Republican U.S. presidential candidate Donald Trump's campaign rally in Costa Mesa

Mike Blake/Reuters

Sheriffs on horseback and police break up a group of demonstrators outside Republican U.S. presidential candidate Donald Trump’s campaign rally in Costa Mesa, California.

Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, center, speaks during a campaign event in New York

John Taggart/Bloomberg

Carlos Barria/Reuters

Republican U.S. presidential candidate Donald Trump’s hand is seen as he reacts during a campaign event in Harrisburg, Pennsylvania

Hillary Clinton...Democratic presidential candidate Hillary Clinton arrives at a campaign stop, Wednesday, April 20, 2016, in Philadelphia. (AP Photo/Matt Rourke)

Matt Rourke/AP

Democratic presidential candidate Hillary Clinton arrives at a campaign stop in Philadelphia 

Hillary Clinton...A Secret Service Agent stands guard as Democratic presidential candidate Hillary Clinton speaks at the Corsi senior center, Friday, April 15, 2016, in New York. (AP Photo/Mary Altaffer)

Mary Altaffer/AP

A Secret Service Agent stands guard as Democratic presidential candidate Hillary Clinton speaks at the Corsi senior center, in New York