Prodded by Trump, Sanders doesn't say yes - or no - to independent White House run

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Senator Bernie Sanders on Debating Trump

Bernie Sanders on Thursday laughed off Donald Trump's attempts to goad him into launching an independent bid for president, but notably did not rule out the prospect.

"I think there is a little bit of self-service there from Donald Trump," the Vermont senator said in an appearance on "Jimmy Kimmel Live."

Kimmel had given Trump, who appeared on his show Wednesday, an opportunity to pass on a question for Sanders.

"Bernie, you have been treated very unfairly," the Republicans' presidential nominee asked, according to Kimmel. "Both primary systems are rigged, but in particular the Democrats' ridiculous system of superdelegates. Will you run as an independent when [Democratic National Committee Chairwoman] Debbie Wasserman Schultz and the party bosses steal this nomination away from you?"

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Bernie Sanders on Jimmy Kimmel Live (3/22/2016)
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Prodded by Trump, Sanders doesn't say yes - or no - to independent White House run
Senator Sanders shares his thoughts on the recent terrorist attacks in Brussels, Belgium. Deleted Scene from "Batman v Superman” Starring Jimmy Kimmel - https://www.youtube.com/watch?v=0Y8iRvQdSGA SUBSCRIBE to get the latest #KIMMEL: http://bit.ly/JKLSubscribe Watch the latest Halloween Candy Prank: http://bit.ly/KimmelHalloweenCandy Watch Mean Tweets: http://bit.ly/JKLMeanTweets8 Connect with Jimmy Kimmel Live Online: Visit the Jimmy Kimmel Live WEBSITE: http://bit.ly/JKLWebsite Like Jimmy Kimmel Live on FACEBOOK: http://bit.ly/JKLFacebook Follow Jimmy Kimmel Live on TWITTER: http://bit.ly/JKLTwitter Follow Jimmy Kimmel Live on INSTAGRAM: http://bit.ly/JKLInstagram About Jimmy Kimmel Live: Jimmy Kimmel serves as host and executive producer of Emmy-winning "Jimmy Kimmel Live," ABC's late-night talk show. "Jimmy Kimmel Live" is well known for its huge viral video successes with 2.5 billion views on YouTube alone. Some of Kimmel's most popular comedy bits include - Mean Tweets, Lie Witness News, Jimmy's Twerk Fail Prank, Unnecessary Censorship, YouTube Challenge, The Baby Bachelor, Movie: The Movie, Handsome Men's Club, Jimmy Kimmel Lie Detective and music videos like "I (Wanna) Channing All Over Your Tatum" and a Blurred Lines parody with Robin Thicke, Pharrell, Jimmy and his security guard Guillermo. Now in its thirteenth season, Kimmel's guests have included: Johnny Depp, Meryl Streep, Tom Cruise, Halle Berry, Harrison Ford, Jennifer Aniston, Will Ferrell, Katy Perry, Tom Hanks, Scarlett Johansson, Channing Tatum, George Clooney, Larry David, Charlize Theron, Mark Wahlberg, Kobe Bryant, Steve Carell, Hugh Jackman, Kristen Wiig, Jeff Bridges, Jennifer Garner, Ryan Gosling, Bryan Cranston, Jamie Foxx, Amy Poehler, Ben Affleck, Robert Downey Jr., Jake Gyllenhaal, Oprah, and unfortunately Matt Damon. Senator Bernie Sanders Responds to the Brussels Terror Attack https://youtu.be/axSW-662tjs
Senator Sanders touches on a number of topics, including Donald Trump, marijuana, climate change and more. Deleted Scene from "Batman v Superman” Starring Jimmy Kimmel - https://www.youtube.com/watch?v=0Y8iRvQdSGA SUBSCRIBE to get the latest #KIMMEL: http://bit.ly/JKLSubscribe Watch the latest Halloween Candy Prank: http://bit.ly/KimmelHalloweenCandy Watch Mean Tweets: http://bit.ly/JKLMeanTweets8 Connect with Jimmy Kimmel Live Online: Visit the Jimmy Kimmel Live WEBSITE: http://bit.ly/JKLWebsite Like Jimmy Kimmel Live on FACEBOOK: http://bit.ly/JKLFacebook Follow Jimmy Kimmel Live on TWITTER: http://bit.ly/JKLTwitter Follow Jimmy Kimmel Live on INSTAGRAM: http://bit.ly/JKLInstagram About Jimmy Kimmel Live: Jimmy Kimmel serves as host and executive producer of Emmy-winning "Jimmy Kimmel Live," ABC's late-night talk show. "Jimmy Kimmel Live" is well known for its huge viral video successes with 2.5 billion views on YouTube alone. Some of Kimmel's most popular comedy bits include - Mean Tweets, Lie Witness News, Jimmy's Twerk Fail Prank, Unnecessary Censorship, YouTube Challenge, The Baby Bachelor, Movie: The Movie, Handsome Men's Club, Jimmy Kimmel Lie Detective and music videos like "I (Wanna) Channing All Over Your Tatum" and a Blurred Lines parody with Robin Thicke, Pharrell, Jimmy and his security guard Guillermo. Now in its thirteenth season, Kimmel's guests have included: Johnny Depp, Meryl Streep, Tom Cruise, Halle Berry, Harrison Ford, Jennifer Aniston, Will Ferrell, Katy Perry, Tom Hanks, Scarlett Johansson, Channing Tatum, George Clooney, Larry David, Charlize Theron, Mark Wahlberg, Kobe Bryant, Steve Carell, Hugh Jackman, Kristen Wiig, Jeff Bridges, Jennifer Garner, Ryan Gosling, Bryan Cranston, Jamie Foxx, Amy Poehler, Ben Affleck, Robert Downey Jr., Jake Gyllenhaal, Oprah, and unfortunately Matt Damon. Senator Bernie Sanders on Trump, Marijuana and Climate Change https://youtu.be/7sT78s578Hg
Senator Sanders laments our long primary election process. Deleted Scene from "Batman v Superman” Starring Jimmy Kimmel - https://www.youtube.com/watch?v=0Y8iRvQdSGA SUBSCRIBE to get the latest #KIMMEL: http://bit.ly/JKLSubscribe Watch the latest Halloween Candy Prank: http://bit.ly/KimmelHalloweenCandy Watch Mean Tweets: http://bit.ly/JKLMeanTweets8 Connect with Jimmy Kimmel Live Online: Visit the Jimmy Kimmel Live WEBSITE: http://bit.ly/JKLWebsite Like Jimmy Kimmel Live on FACEBOOK: http://bit.ly/JKLFacebook Follow Jimmy Kimmel Live on TWITTER: http://bit.ly/JKLTwitter Follow Jimmy Kimmel Live on INSTAGRAM: http://bit.ly/JKLInstagram About Jimmy Kimmel Live: Jimmy Kimmel serves as host and executive producer of Emmy-winning "Jimmy Kimmel Live," ABC's late-night talk show. "Jimmy Kimmel Live" is well known for its huge viral video successes with 2.5 billion views on YouTube alone. Some of Kimmel's most popular comedy bits include - Mean Tweets, Lie Witness News, Jimmy's Twerk Fail Prank, Unnecessary Censorship, YouTube Challenge, The Baby Bachelor, Movie: The Movie, Handsome Men's Club, Jimmy Kimmel Lie Detective and music videos like "I (Wanna) Channing All Over Your Tatum" and a Blurred Lines parody with Robin Thicke, Pharrell, Jimmy and his security guard Guillermo. Now in its thirteenth season, Kimmel's guests have included: Johnny Depp, Meryl Streep, Tom Cruise, Halle Berry, Harrison Ford, Jennifer Aniston, Will Ferrell, Katy Perry, Tom Hanks, Scarlett Johansson, Channing Tatum, George Clooney, Larry David, Charlize Theron, Mark Wahlberg, Kobe Bryant, Steve Carell, Hugh Jackman, Kristen Wiig, Jeff Bridges, Jennifer Garner, Ryan Gosling, Bryan Cranston, Jamie Foxx, Amy Poehler, Ben Affleck, Robert Downey Jr., Jake Gyllenhaal, Oprah, and unfortunately Matt Damon. Senator Bernie Sanders on America's Long Election Process https://youtu.be/lpyLPfNj964
Senator Sanders talks about his relationship with Secretary Clinton and points out a big difference between the two of them. Deleted Scene from "Batman v Superman” Starring Jimmy Kimmel - https://www.youtube.com/watch?v=0Y8iRvQdSGA SUBSCRIBE to get the latest #KIMMEL: http://bit.ly/JKLSubscribe Watch the latest Halloween Candy Prank: http://bit.ly/KimmelHalloweenCandy Watch Mean Tweets: http://bit.ly/JKLMeanTweets8 Connect with Jimmy Kimmel Live Online: Visit the Jimmy Kimmel Live WEBSITE: http://bit.ly/JKLWebsite Like Jimmy Kimmel Live on FACEBOOK: http://bit.ly/JKLFacebook Follow Jimmy Kimmel Live on TWITTER: http://bit.ly/JKLTwitter Follow Jimmy Kimmel Live on INSTAGRAM: http://bit.ly/JKLInstagram About Jimmy Kimmel Live: Jimmy Kimmel serves as host and executive producer of Emmy-winning "Jimmy Kimmel Live," ABC's late-night talk show. "Jimmy Kimmel Live" is well known for its huge viral video successes with 2.5 billion views on YouTube alone. Some of Kimmel's most popular comedy bits include - Mean Tweets, Lie Witness News, Jimmy's Twerk Fail Prank, Unnecessary Censorship, YouTube Challenge, The Baby Bachelor, Movie: The Movie, Handsome Men's Club, Jimmy Kimmel Lie Detective and music videos like "I (Wanna) Channing All Over Your Tatum" and a Blurred Lines parody with Robin Thicke, Pharrell, Jimmy and his security guard Guillermo. Now in its thirteenth season, Kimmel's guests have included: Johnny Depp, Meryl Streep, Tom Cruise, Halle Berry, Harrison Ford, Jennifer Aniston, Will Ferrell, Katy Perry, Tom Hanks, Scarlett Johansson, Channing Tatum, George Clooney, Larry David, Charlize Theron, Mark Wahlberg, Kobe Bryant, Steve Carell, Hugh Jackman, Kristen Wiig, Jeff Bridges, Jennifer Garner, Ryan Gosling, Bryan Cranston, Jamie Foxx, Amy Poehler, Ben Affleck, Robert Downey Jr., Jake Gyllenhaal, Oprah, and unfortunately Matt Damon. Senator Bernie Sanders' Relationship with Hillary Clinton https://youtu.be/fFc90Jddd6U
Senator Sanders talks about walking around and meeting people on Hollywood Blvd. before the taping of our show. Deleted Scene from "Batman v Superman” Starring Jimmy Kimmel - https://www.youtube.com/watch?v=0Y8iRvQdSGA SUBSCRIBE to get the latest #KIMMEL: http://bit.ly/JKLSubscribe Watch the latest Halloween Candy Prank: http://bit.ly/KimmelHalloweenCandy Watch Mean Tweets: http://bit.ly/JKLMeanTweets8 Connect with Jimmy Kimmel Live Online: Visit the Jimmy Kimmel Live WEBSITE: http://bit.ly/JKLWebsite Like Jimmy Kimmel Live on FACEBOOK: http://bit.ly/JKLFacebook Follow Jimmy Kimmel Live on TWITTER: http://bit.ly/JKLTwitter Follow Jimmy Kimmel Live on INSTAGRAM: http://bit.ly/JKLInstagram About Jimmy Kimmel Live: Jimmy Kimmel serves as host and executive producer of Emmy-winning "Jimmy Kimmel Live," ABC's late-night talk show. "Jimmy Kimmel Live" is well known for its huge viral video successes with 2.5 billion views on YouTube alone. Some of Kimmel's most popular comedy bits include - Mean Tweets, Lie Witness News, Jimmy's Twerk Fail Prank, Unnecessary Censorship, YouTube Challenge, The Baby Bachelor, Movie: The Movie, Handsome Men's Club, Jimmy Kimmel Lie Detective and music videos like "I (Wanna) Channing All Over Your Tatum" and a Blurred Lines parody with Robin Thicke, Pharrell, Jimmy and his security guard Guillermo. Now in its thirteenth season, Kimmel's guests have included: Johnny Depp, Meryl Streep, Tom Cruise, Halle Berry, Harrison Ford, Jennifer Aniston, Will Ferrell, Katy Perry, Tom Hanks, Scarlett Johansson, Channing Tatum, George Clooney, Larry David, Charlize Theron, Mark Wahlberg, Kobe Bryant, Steve Carell, Hugh Jackman, Kristen Wiig, Jeff Bridges, Jennifer Garner, Ryan Gosling, Bryan Cranston, Jamie Foxx, Amy Poehler, Ben Affleck, Robert Downey Jr., Jake Gyllenhaal, Oprah, and unfortunately Matt Damon. Senator Bernie Sanders Met with Voters on Hollywood Blvd https://youtu.be/sNJs_rqboBQ
LOS ANGELES, CA - MARCH 22: Presidential candidate Bernie Sanders is seen on Hollywood Blvd. on March 22, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 22: Presidential candidate Bernie Sanders is seen on Hollywood Blvd. on March 22, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 22: Presidential candidate Bernie Sanders is seen on Hollywood Blvd. on March 22, 2016 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Tuesday, March 22 included presidential candidate Bernie Sanders, Tom Hiddleston ('The Night Manager') and musical guest Granger Smith. (Photo by Randy Holmes/ABC via Getty Images) BERNIE SANDERS
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Tuesday, March 22 included presidential candidate Bernie Sanders, Tom Hiddleston ('The Night Manager') and musical guest Granger Smith. (Photo by Randy Holmes/ABC via Getty Images) BERNIE SANDERS, JIMMY KIMMEL
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Tuesday, March 22 included presidential candidate Bernie Sanders, Tom Hiddleston ('The Night Manager') and musical guest Granger Smith. (Photo by Randy Holmes/ABC via Getty Images) BERNIE SANDERS, JIMMY KIMMEL
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Tuesday, March 22 included presidential candidate Bernie Sanders, Tom Hiddleston ('The Night Manager') and musical guest Granger Smith. (Photo by Randy Holmes/ABC via Getty Images) JIMMY KIMMEL, BERNIE SANDERS, JANE SANDERS
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight at 11:35 p.m. EST and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Tuesday, March 22 included presidential candidate Bernie Sanders, Tom Hiddleston ('The Night Manager') and musical guest Granger Smith. (Photo by Randy Holmes/ABC via Getty Images) BERNIE SANDERS
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"You think he's really worried about me?" Sanders joked. "I really appreciate his concern for me. I know it comes straight from his heart."

But he didn't directly answer the question.

"What I hope will happen is in fact that I will run against him as the Democratic nominee for president of the United States," he said, "and if I do, we're going to beat him and beat him bad."

The host had given Sanders the same option ahead of Trump's appearance; Sanders asked if Trump was willing to debate, and the former reality television star said he would – for charity.

Trump, who has nicknamed him "Crazy Bernie," has for several weeks feigned concern for Sanders, playing off Sanders' supporters accusations that the Democratic National Committee had tilted the scales in favor of Hillary Clinton, the party's front-runner.

With just a handful of states yet to hold their primaries, Sanders trails Clinton by nearly 300 pledged delegates and more than 3 million votes. To overtake her, Sanders would have to win 68 percent of the delegates still available – far exceeding the 46 percent he has so far – and convince a majority of superdelegates to swing his way.

If Sanders were indeed considering a third-party run, however, it would contradict his vow not to do so if he lost the Democratic nomination.

"If it happens that I do not win that process, would I run outside of the system? No," he told the Hispanic Chamber of Congress in July. "I made the promise that I would not and I'll keep that promise."

Jane Sanders, his wife and a top campaign surrogate, reiterated the pledge after Trump made sympathy for Sanders' treatment a regular part of his stump speech.

"We've been very clear right from the beginning that we will not play the role of spoiler," his wife, Jane Sanders, told CNN in late April. "The reason that he was active and he decided to run in the Democratic Party was just that: We cannot afford a Republican in the White House. We cannot afford a Republican appointing Supreme Court justices. So Bernie will not be running as an independent."

Still, Democrats have publicly worried that Sanders, having fallen out of real contention in the primary but refusing to drop out, would damage Clinton's ability to unite the party against Trump in the fall.

At campaign rallies, the senator has vacillated, sometimes toning down his rhetoric against Clinton and aiming his fire at Trump, but other times blasting Clinton, Wasserman Schultz and the system he says has hamstrung his campaign.

While Sanders has promised to fight for every vote through the end of the primaries – and is doing everything he can to keep his supporters engaged – he has privately assured Democrats he will work for unity.

Last week, Sanders called several Senate colleagues, insisting he would go to bat for Clinton if she were the nominee.

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Bernie Sanders supporters
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Prodded by Trump, Sanders doesn't say yes - or no - to independent White House run
Supporters stand in the crowd cheering as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
A man covered in face paint waits to see U.S. Democratic presidential candidate Bernie Sanders during a campaign event in Vallejo, California, May 18, 2016. REUTERS/Stephen Lam TPX IMAGES OF THE DAY
Supporters stand in the crowd cheering as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
A supporter holds a sign as the crowd waits for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
Women hold up signs and cheer as they wait for U.S. Democratic presidential candidate Bernie Sanders to speak during a rally in Carson, California, U.S., May 17, 2016. REUTERS/Lucy Nicholson
UCLA graduate Miguel Rodriguez, 32, (R) and Joannie Small, 4, queue to listen to U.S. Democratic presidential candidate Bernie Sanders speak at a campaign rally at Casa del Mexicano in Los Angeles, California, U.S. June 4, 2016. REUTERS/Lucy Nicholson
A Bernie Sanders supporter texts before the U S. Democratic presidential candidate's campaign rally at Colton Hall in Monterey, California, U.S., May 31, 2016. REUTERS/Michael Fiala
Bernie Sanders supporter Drew Rainer dances prior to the U S. Democratic presidential candidate's campaign rally at Colton Hall in Monterey, California, U.S., May 31, 2016. REUTERS/Michael Fiala
An attendee reacts as Democratic U.S. presidential candidate Bernie Sanders prepares to enter Kaiser Permanente Arena during a campaign rally in Santa Cruz, California May 31, 2016. REUTERS/Stephen Lam
An attendee holds a sign in support of Democratic U.S. presidential candidate Bernie Sanders during a campaign rally in Santa Cruz, California, U.S., May 31, 2016. REUTERS/Stephen Lam
A woman holds a sign in support of Democratic U.S. presidential candidate Bernie Sanders during a campaign rally in Santa Cruz, California, U.S., May 31, 2016. REUTERS/Stephen Lam
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders as he speaks at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters listen as U.S. Democratic presidential candidate Bernie Sanders speaks at a campaign rally in Santa Maria, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders as he speaks at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
Supporters wait for U.S. Democratic presidential candidate Bernie Sanders to speak at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders greets supporters after a campaign rally in Santa Maria, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson
U.S. Democratic presidential candidate Bernie Sanders looks as supporters wish him and his wife a happy wedding anniversary at a campaign rally in Santa Barbara, California, U.S. May 28, 2016. REUTERS/Lucy Nicholson TPX IMAGES OF THE DAY
Tyler Morris holds up look-a-like puppet of Democratic U.S. presidential candidate Bernie Sanders is held up during campaign event in San Pedro, California, U.S. May 27, 2016. REUTERS/Kevork Djansezian
A supporter holds a poster of Democratic U.S. presidential candidate Bernie Sanders at a campaign event in San Pedro, California , U.S. May 27, 2016. REUTERS/Kevork Djansezian FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
Supporter Tina Boyd holds signs inside Johnie's Coffee Shop, which has been closed since 2000, during a one night only re-opening for a rally in favor of Democratic U.S. presidential candidate Bernie Sanders in Los Angeles, U.S., May 26, 2016. REUTERS/Mario Anzuoni
Supporters of U.S. Democratic presidential candidate Bernie Sanders cheer at a campaign event in Ventura, California, U.S. May 26, 2016. REUTERS/Jonathan Alcorn
Charles Parker of Desert Hot Springs shows off his large replica U S. Democratic presidential candidate Bernie Sanders head while waiting in line to hear the senator speak at a campaign rally in Cathedral City, California, U.S., May 25, 2016. REUTERS/Alex Gallardo
Bradley Giles of Cathedral City waits to enter to hear U.S. Democratic presidential candidate Bernie Sanders speak at a campaign rally in Cathedral City, California, U.S., May 25, 2016. REUTERS/Alex Gallardo
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders arrives to speak at a rally in Anaheim, California, United States, May 24, 2016. REUTERS/Mike Blake
Supporters wait in line to attend a morning rally for U.S. Democratic presidential candidate Bernie Sanders in Anaheim, California, U.S., May 24, 2016. REUTERS/Mike Blake
Supporters listen to U.S. Democratic presidential candidate Bernie Sanders speak in Santa Monica, California, U.S., May 23, 2016. REUTERS/Lucy Nicholson
Supporters hold signs after U.S. Democratic presidential candidate Bernie Sanders' motorcade passed by in Santa Monica, California, U.S., May 23, 2016. REUTERS/Lucy Nicholson
Supporter Maria Antonio waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
Supporter Mette Peluce, 11, waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson. TPX IMAGES OF THE DAY
Supporter Koelen Andrews, 34, waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
Supporters wait for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson
A supporter waits for U.S. Democratic presidential candidate Bernie Sanders to speak in East Los Angeles, California, U.S. May 23, 2016. REUTERS/Lucy Nicholson FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.
People cheer at a campaign rally for U S. Democratic presidential candidate Bernie Sanders in Irvine, California, U.S. May 22, 2016. REUTERS/Alex Gallardo
Young female supports cheer as U.S. Democratic presidential candidate Bernie Sanders steps up to the podium during a rally in Vista, California, United States May 22, 2016. REUTERS/Mike Blake
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders speaks during a rally in Vista, California, United States, May 22, 2016. REUTERS/Mike Blake
Joshua Zepeda of Escondido, takes off his shirt as he attends a rally for U.S. Democratic presidential candidate Bernie Sanders in Vista, California, United States, May 22, 2016. REUTERS/Mike Blake
A supporter of U.S. Democratic presidential candidate Bernie Sanders wears a wig in San Juan, Puerto Rico, May 16, 2016. REUTERS/Alvin Baez
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
From left, Myrna Leon, her daughter Bella Leon and her mother Frances Hernandez cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
Supporters cheer for U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Stockton, California, United States, May 10, 2016. REUTERS/Max Whittaker
Supporters cheer and hold up banners before the arrival of U.S. Democratic presidential candidate Bernie Sanders at a campaign rally in Sacramento, California United States May 9, 2016. REUTERS/Fred Greaves
Brydon Sullivan, 8, wearing a Bernie Sanders costume, waits for the U.S. Democratic presidential candidate Sanders to arrive at a campaign rally in Sacramento, California United States May 9, 2016. REUTERS/Fred Greaves
Supporters cheer as U.S. Democratic presidential candidate Bernie Sanders speaks at a campaign rally in New Brunswick, New Jersey, U.S., May 8, 2016. REUTERS/Dominick Reuter
Democratic presidential candidate Bernie Sanders addresses the crowd during a campaign rally at Heritage Hall in Lexington, Kentucky, U.S. May 4, 2016. REUTERS/John Sommers II
Supporters of Democratic U.S. presidential candidate and U.S. Senator Bernie Sanders cheer during his five state primary night rally in Huntington, West Virginia, U.S., April 26, 2016. REUTERS/Marcus Constantino
ATLANTIC CITY, NJ - MAY 9: Bernie Sanders supporters cheer during a rally with the Democratic presidential hopeful at Boardwalk Hall on May 9, 2016 in Atlantic City, New Jersey. Sanders is campaigning in New Jersey ahead of the state's primary on June 7. (Photo by Mark Makela/Getty Images)
PORTLAND, ME - MAY 5: Bernie Sanders supporters holding a 'We Love Bernie March' a day before the state Democratic Party Convention march down Congress St. in Portland Thursday, May 5, 2016. (Photo by Shawn Patrick Ouellette/Portland Press Herald via Getty Images)
LOUISVILLE, KY - MAY 3: Campaign supporters show their support for Democratic presidential candidate Bernie Sanders as he speaks to them during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary. (Photo by John Sommers II/Getty Images)
LOUISVILLE, KY - MAY 3: Campaign supporters show their support for Democratic presidential candidate Bernie Sanders as he speaks to them during a campaign rally at the Big Four Lawn park May 3, 2016 in Louisville, Kentucky. Sanders is preparing for Kentucky's May 17th primary. (Photo by John Sommers II/Getty Images)
SOUTH BEND, IN - MAY 01: People cheer as Democratic presidential candidate Bernie Sanders (D-VT) speaks during a campaign rally at the Century Center on May 1, 2016 in South Bend, Indiana. Sanders continues to campaign leading up to the state of Indiana's primary day on Tuesday. (Photo by Joe Raedle/Getty Images)
INDIANAPOLIS, IN - APRIL 29: People listen as Democratic presidential candidate and U.S. Sen. Bernie Sanders (D-VT) speaks during a rally at the Indiana state Capitol on April 29, 2016 in Indianapolis, Indiana. Sanders addressed the rally of mostly union workers and their supporters protesting the Carrier Corp. plans to cut 1,400 manufacturing jobs in Indianapolis and move 2,100 jobs to Mexico. (Photo by Joe Raedle/Getty Images)
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