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epa05442919 Delegates react as Democratic Nominee for United States President Hillary Clinton appears live via satellite at the conclusion of the second day of the Democratic National Convention at the Wells Fargo Center in Philadelphia, Pennsylvania, USA, 26 July 2016. The four-day convention is expected to end with Hillary Clinton formally accepting the nomination of the Democratic Party as their presidential candidate in the 2016 election.

Justin Lane/EPA

Delegates react as Democratic Nominee for United States President Hillary Clinton appears live via satellite at the conclusion of the second day of the Democratic National Convention at the Wells Fargo Center in Philadelphia, Pennsylvania, USA 

Jaimes Campbell, who advocates for open carry, stands with a gun as police walk by in Cleveland Public Square outside the Republican National Convention in Cleveland, Ohio

Andrew Kelly/Reuters

Jaimes Campbell, who advocates for open carry, stands with a gun as police walk by in Cleveland Public Square outside the Republican National Convention in Cleveland, Ohio.

BATON ROUGE, LA - JULY 15:  The body of Alton Sterling, who was shot and killed by Baton Rouge Police officers, lies in a casket as he is brought into his funeral at Southern University on July 15, 2016 in Baton Rouge, Louisiana.  (Photo by Sean Gardner/Getty Images)

Sean Gardner/Getty

The body of Alton Sterling, who was shot and killed by Baton Rouge Police officers, lies in a casket as he is brought into his funeral at Southern University in Baton Rouge, Louisiana 

A woman stands by a makeshift memorial at the Triple S convenience store where Alton Sterling was shot dead by police in Baton Rouge, Louisiana, U.S., July 11, 2016. REUTERS/Shannon Stapleton

Shannon Stapleton/Reuters

A woman stands by a makeshift memorial at the Triple S convenience store where Alton Sterling was shot dead by police in Baton Rouge in Louisiana

 A spotlight catches the top of Democratic presidential candidate Hillary Clinton's head, as she enters to address the National Education Association's 95th Representative Assembly in Washington, DC, USA, 05 July 2016. NEA is the largest labor union in the United States.  EPA/MICHAEL REYNOLDS

Michael Reynolds/EPA

A spotlight catches the top of Democratic presidential candidate Hillary Clinton‘s head, as she enters to address the National Education Association’s 95th Representative Assembly in Washington D.C.

US Track Trials Athletics

AP Photo/Matt Slocum

Sam Kendricks competes the men’s pole vault event at the U.S. Olympic Track and Field Trials, in Eugene Ore

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.