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epa05386225 Police officers stand guard outside the courthouse before a verdict was issued in the trial of police officer Caesar Goodson, one of six Baltimore police officers charged over the death of Freddie Gray, in Baltimore, Maryland, USA, 23 June 2016. A judge issued a verdict of not-guilty in all accounts in the trial of Goodson.  EPA/MICHAEL REYNOLDS

Michael Reynolds/EPA

Police officers stand guard outside the courthouse before a verdict was issued in the trial of police officer Caesar Goodson, one of six Baltimore police officers charged over the death of Freddie Gray, in Baltimore, Maryland. A judge issued a verdict of not-guilty in all accounts in the trial of Goodson.

US Democrats staged a rare sit-in Wednesday in the House of Representatives, demanding that the Republican-led body vote on gun-control legislation following the Orlando nightclub massacre

Handout/AFP/Getty

US Democrats staged a rare sit-in Wednesday in the House of Representatives, demanding that the Republican-led body vote on gun-control legislation following the Orlando nightclub massacre

epa05381363 A Fairfax County police officer outside the headquarters of the National Rifle Association (NRA) beneath a paper heart inscribed with the name of a victim of the Orlando shooting massacre in Fairfax, VA, USA, 21 June 2016. On 20 June, the US Senate failed to pass four gun control amendments in the wake of the largest mass shooting in US history.  EPA/JIM LO SCALZO

Jim Lo Scalzo/EPA

A paper heart inscribed with the name of a victim of the Orlando shooting massacre in Fairfax obscures the face of a Fairfax County police officer outside the headquarters of the National Rifle Association (NRA)

Runners pass under the the flags flying at half-staff around the Washington Monument at daybreak in Washington, Monday, June 13, 2016. The flags were ordered to half-staff by President Barack Obama to honor the victims of the Orlando nightclub shootings. (AP Photo/J. David Ake)

David Ake/AP

Runners pass under the the flags flying at half-mast around the Washington Monument at daybreak in Washington. The flags were ordered to half-staff by President Barack Obama to honor the victims of the Orlando nightclub shootings 

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

Boxing gloves and a message sit among flowers at a makeshift memorial to Muhammad Ali at the Muhammad Ali Center, in Louisville, USA.

David Goldman/AP

Boxing gloves and a message sit among flowers at a makeshift memorial to Muhammad Ali at the Muhammad Ali Center, in Louisville, USA

Lightning from a severe storm fills the sky behind a grain elevator in Belvue, Kan., Wednesday, May 25, 2016. The storm produced tornadoes near Chapman, Kan. (AP Photo/Orlin Wagner)

Orlin Wagner/AP

Lightning from a severe storm fills the sky behind a grain elevator in Belvue, Kansas

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 

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

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

U.S. servicemen wait for an opening ceremony of U.S. led joint military exercise "Noble Partner 2016" in Vaziani, Georgia, May 11, 2016. REUTERS/David Mdzinarishvili

David Mdzinarishvili/Reuters

U.S. servicemen wait for an opening ceremony of U.S. led joint military exercise “Noble Partner 2016″ in Vaziani, Georgia 

Presidential Candidate Hillary Clinton Holds Kentucky Campaign Rally...An attendee wears campaign buttons before the start of an event for Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, not pictured, in Louisville, Kentucky, U.S., on Tuesday, May 10, 2016. Clinton said she sees "a great role" for Bernie Sanders and his supporters in a "unified party," even as she said she welcomed Republicans who are not supporting presumptive nominee Donald Trump. Photographer: Luke Sharrett/Bloomberg

Luke Sharrett/Bloomberg

An attendee wears campaign buttons before the start of an event for Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, in Louisville, Kentucky 

Vehicles stop on the side of a road as a...Vehicles stop on the side of a road as a tornado rips through a residential area after touching down south of Wynnewood, Oklahoma on May 09, 2016.  The tornado touched down quickly and destroyed an unknown number of structures before a series of other twisters riddled the area. One person is confirmed dead. == RESTRICTED TO EDITORIAL USE  / MANDATORY CREDIT:  "AFP PHOTO / HANDOUT / Josh EDELSON" / NO MARKETING / NO ADVERTISING CAMPAIGNS /  DISTRIBUTED AS A SERVICE TO CLIENTS  / GETTY OUT ==

Josh Edelson/AFP

Vehicles stop on the side of a road as a tornado rips through a residential area after touching down south of Wynnewood, Oklahoma. The tornado touched down quickly and destroyed an unknown number of structures before a series of other twisters riddled the area. One person is confirmed dead. 

A horse gets a bath after a morning workout at Churchill Downs Friday, May 6, 2016, in Louisville, Ky. The 142nd running of the Kentucky Derby is scheduled for Saturday, May 7. (AP Photo/Charlie Riedel)

Charlie Riedel/AP

A horse gets a bath after a morning workout at Churchill Downs in Louisville, Kentucky. The 142nd running of the Kentucky Derby is scheduled for Saturday 

US Presidential primary voting in Maryland...epa05278084 'I voted' stickers are handed out to voters after they cast their ballots during the Maryland presidential primary election at Skyline Elementary School in Suitland, Maryland, USA, 26 April 2016. Citizens of Maryland, Pennsylvania, Delaware, Connecticut and Rhode Island are casting their votes in state primary elections today.  EPA/SHAWN THEW

Shawn Thew/EPA

‘I voted’ stickers are handed out to voters after they cast their ballots during the Maryland presidential primary election at Skyline Elementary School in Suitland, Maryland 

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 

Brock Holt...Boston Red Sox left fielder Brock Holt (12) plays a double by Tampa Bay Rays designated hitter Corey Dickerson off the wall during fourth inning of a baseball game in Boston, Wednesday, April 20, 2016. (AP Photo/Charles Krupa)

Charles Krupa/AP

Boston Red Sox left fielder Brock Holt plays a double by Tampa Bay Rays designated hitter Corey Dickerson off the wall during fourth inning of a baseball game in Boston 

New York Stock Exchange...epa05268814 Traders work on the floor of the New York Stock Exchange (NYSE) at the start of the trading day in New York, New York, USA, 20 April 2016.  EPA/JUSTIN LANE

Justin Lane/EPA

Traders work on the floor of the New York Stock Exchange (NYSE) at the start of the trading day in New York

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