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Diamondbacks Mariners Spring Baseball...Fans walk through a concourse under a United States flag during the seventh inning of a spring training baseball game between the Seattle Mariners and the Arizona Diamondbacks, Monday, March 7, 2016, in Peoria, Ariz. (AP Photo/Charlie Riedel)

Charlie Riedel/AP

Fans walk through a concourse under a United States flag during the seventh inning of a spring training baseball game between the Seattle Mariners and the Arizona Diamondbacks in Peoria, Arizona

Elise Amendola/AP

Voters cast ballots at a polling station for Massachusetts’ primary election, as Super Tuesday starts in North Andover, Mass USA

Voting under way in Super Tuesday US primaries ...epa05188421 Virginia residents wait in line in the pre-dawn hours to vote in the Virginia primary at a historic property called the Hunter House at Nottoway Park in Vienna, Virginia, USA, 01 March 2016. Voters were heading to the polls in a dozen US states on so-called Super Tuesday, the biggest prize yet of the US primary election season to determine the Republican and Democratic presidential candidates.  EPA/JIM LO SCALZO

Jim Lo Scalzo/EPA

Virginia residents wait in line in the pre-dawn hours to vote in the Virginia primary at a historic property called the Hunter House at Nottoway Park in Vienna, Virginia, USA

Hillary Clinton...Democratic presidential candidate Hillary Clinton acknowledges the crowd as she arrives to speak at a "Get Out The Vote" campaign rally in Norfolk, S.C., Monday, Feb. 29, 2016. (AP Photo/Gerald Herbert)

Gerald Herbert/AP

Democratic presidential candidate Hillary Clinton acknowledges the crowd as she arrives to speak at a “Get Out The Vote” campaign rally in Norfolk, Virginia 

A fake dollar bill with US Republican pr...A fake dollar bill with US Republican presidential candidate Donald Trump's picture on it is displayed for sale with other electoral items at a roadside stall as pedestrians walk past in New York on February 26, 2016. White House hopefuls Ted Cruz and Marco Rubio unleashed a barrage of attacks against Donald Trump during raucous Republican debate on February 25, as they sought to halt the billionaire frontrunner's seemingly relentless march to the party's nomination. / AFP / Jewel SamadJEWEL SAMAD/AFP/Getty Images

Jewel Samad/AFP

A fake dollar bill with US Republican presidential candidate Donald Trump’s picture on it is displayed for sale with other electoral items at a roadside stall as pedestrians walk past in New York 

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.