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Demonstrators protesting for an increase in the minimum wage enter the media file center at the PBS NewsHour Democratic presidential candidate debate at the University of Wisconsin-Milwaukee

Win McNamee/Getty Images

Demonstrators protesting for an increase in the minimum wage enter the media file center at the PBS NewsHour Democratic presidential candidate debate at the University of Wisconsin-Milwaukee

President Barack Obama returns a salute as he boards Air Force One before his departure from Andrews Air Force Base, Maryland. USA

Pablo Martinez Monsivais/AP

President Barack Obama returns a salute as he boards Air Force One before his departure from Andrews Air Force Base

Win McNamee/Getty

Democratic presidential candidate, Sen. Bernie Sanders addresses supporters after winning the New Hampshire Democratic primary in Concord, New Hampshire. Sanders defeated Democratic presidential candidate Hillary Clinton in the first-in-the-nation primary

Presidential Candidate Hillary Clinton Holds Iowa Get Out The Caucus Rallies...A supporter waves signs supporting Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, outside a campaign event at Abraham Lincoln High School in Des Moines, Iowa, U.S., on Sunday, Jan. 31, 2016. Hillary Clinton is holding onto a slim lead over Bernie Sanders in Iowa as Democrats prepare for Monday's caucuses, though an outpouring of young voters and those who say the system is rigged could enable Sanders to pull off an upset, according to a new poll. Photographer: Daniel Acker/Bloomberg

Daniel Acker/Bloomberg

A supporter waves signs supporting Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, outside a campaign event at Abraham Lincoln High School in Des Moines, Iowa, U.S 

A volunteer for U.S. Democratic presidential candidate Sanders holds the door open ahead of a campaign rally in Fairfield, Iowa...Billy Hunter, a volunteer for U.S. Democratic presidential candidate Bernie Sanders, holds a door open while waiting for Sanders to arrive at a campaign rally in Fairfield, Iowa January 28, 2016. REUTERS/Mark Kauzlarich

Mark Kauzlarich/Reuters

Billy Hunter, a volunteer for U.S. Democratic presidential candidate Bernie Sanders, holds a door open while waiting for Sanders to arrive at a campaign rally in Fairfield, Iowa 

Hillary Clinton Holds Get Out The Caucus Event In Iowa...ADEL, IA - JANUARY 27:  Democratic presidential candidate former Secretary of State Hillary Clinton greets supporters during a "get out the caucus" event at the Adel Family Fun Center on January 27, 2016 in Adel, Iowa.  With less than a week to go before the Iowa caucuses, Hillary Clinton is campaigning throughout Iowa.  (Photo by Justin Sullivan/Getty Images)

Justin Sullivan/Getty

Democratic presidential candidate former Secretary of State Hillary Clinton greets supporters during a “get out the caucus” event at the Adel Family Fun Center in Adel, Iowa. With less than a week to go before the Iowa caucuses, Hillary Clinton is campaigning throughout Iowa 

Presidential Candidate Donald Trump Holds Iowa City Campaign Rally...Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, reacts to a protester during an event in Iowa City, Iowa, U.S., on Tuesday, Jan. 26, 2016. Citing unfair treatment by Fox News, Trump will not participate in the Republican presidential debate on Thursday, his campaign manager told reporters. Photographer: Patrick T. Fallon/Bloomberg *** Local Caption *** Donald Trump

Patrick T. Fallon/Bloomberg

Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, reacts to a protester during an event in Iowa City, Iowa, U.S. 

Brynn Anderson/AP

Supporters of Democratic presidential candidate Sen. Bernie Sanders cheer during a campaign stop, in Birmingham, Alabama 

A flight deck crew prepares to launch a F18 Super Hornet from the deck of the USS Eisenhower off the coast of Virginia

Mark Wilson/Getty Images

A flight deck crew prepares to launch a F18 Super Hornet from the deck of the USS Eisenhower off the coast of Virginia

Soldiers from South Korea (L) and the US (R) gesture as they set up a floating bridge during a US-South Korea joint river crossing exercise

  © hap/AFP

Soldiers from South Korea (L) and the US (R) gesture as they set up a floating bridge during a US-South Korea joint river crossing exercise in the border county of Yeoncheon, northeast of Seoul

Cathleen Garcia holds a candle during a vigil to honour shooting victims in San Bernardino, California

Jae C Hong/AP

Cathleen Garcia holds a candle during a vigil to honour shooting victims in San Bernardino, California

People protest in  front of NBC studios ...People protest in  front of NBC studios while they are calling for the network to rescind the invitation to Donald Trump to host Saturday Night Live show on November 4, 2015 in New York. Trump is expected to host SNL on November 7th, but protesters plan to deliver a petition, with 460,000 signatures, calling on NBC Studios to drop Trump. AFP PHOTO/ KENA BETANCURKENA BETANCUR/AFP/Getty Images

Kena Betancur/AFP

People protest in front of NBC studios while they are calling for the network to rescind the invitation to Donald Trump to host Saturday Night Live show in New York. Trump is expected to host SNL on November 7th 

People take part in candlelight vigil

  © e Dipaola/Reuters

People take part in candlelight vigil following a mass shooting at Umpqua Community College in Roseburg, Oregon. A gunman opened fire at a community college in southwest Oregon yesterday, killing nine people and wounding seven others before police shot him to death, authorities said, in the latest mass killing to rock an American campus.

Miss Georgia, Betty Cantrell, reacts to advancing, en route to victory, at the Miss America Pageant at Boardwalk Hall, in Atlantic City, New Jersey

Mark Makela/Reuters

Miss Georgia, Betty Cantrell, reacts to advancing, en route to victory, at the Miss America Pageant at Boardwalk Hall, in Atlantic City, New Jersey.

A house is engulfed in flames as firefighters attempt to put it out during the Valley fire in Seigler Springs, California.

Josh Edelson/AFP/Getty Images

A house is engulfed in flames as firefighters attempt to put it out during the Valley fire in Seigler Springs, California.

President Obama, First Lady Hold Moment Of Silence On Anniversary Of 9/11 Attacks...WASHINGTON, DC - SEPTEMBER 11:  A man jogs past a row of American flags that have been lowered to half staff on the Washington Monument grounds, near the US Capitol on September 11, 2015 in Washington, DC. Today marks the fourteenth anniversary of the September 11, 2001 attacks when terroristists high jacked airliners and flew them in the World Trade Center and the Pentagon.  (Photo by Mark Wilson/Getty Images)

Mark Wilson/Getty

A man jogs past a row of American flags that have been lowered to half staff on the Washington Monument grounds, near the US Capitol Hill. Friday marks the fourteenth anniversary of the September 11, 2001 attacks when terrorists high jacked airliners and flew them in the World Trade Center and the Pentagon. 

Atlas V Launch...The United Launch Alliance Atlas V rocket takes off from Cape Canaveral Air Force Station Launch Complex 41, viewed from the seawall at Milliken's Reef at Port Canaveral, Fla., early Wednesday, Sept. 2, 2015. The rocket is carrying a U.S. Navy communications satellite. (Malcolm Denemark/Florida Today via AP) NO SALES; MANDATORY CREDIT; MAGS OUT

Malcolm Denemark/Florida Today/AP

The United Launch Alliance Atlas V rocket takes off from Cape Canaveral Air Force Station Launch Complex 41 photographed from the seawall at Milliken’s Reef at Port Canaveral, Florida. The rocket is carrying a U.S. Navy communications satellite

A spider is silhouetted against a string of lights in Overland Park, Kansas.

Charlie Riedel/AP

Miami Marlins' Dee Gordon slides safely past Milwaukee Brewers catcher Jonathan Lucroy during the fifth inning of a baseball game in Milwaukee.

Morry Gash/AP

Miami Marlins’ Dee Gordon slides safely past Milwaukee Brewers’ catcher Jonathan Lucroy during the fifth inning of a baseball game in Milwaukee.

Ferguson, Missouri Marks One-Year Anniversary Of The Death Of Michael Brown...FERGUSON, MO - AUGUST 09:  Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, march along West Florrisant Street in a driving rain on August 9, 2015 in Ferguson, Missouri. There are reports that two people were shot when gun fire broke out during protests later in the evening. Brown was shot and killed by a Ferguson police officer on August 9, 2014. His death sparked months of sometimes violent protests in Ferguson and drew nationwide focus on police treatment of black offenders.  (Photo by Scott Olson/Getty Images)

Scott Olson/Getty

Demonstrators, marking the one-year anniversary of the shooting of Michael Brown, march along West Florrisant Street in Ferguson, Missouri. There are reports that two people were shot when gun fire broke out during protests later in the evening.