'Run, Bernie, Run': Trump keeps imploring Bernie Sanders to mount a 3rd-party bid for president

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Vermonters 'barnstorm' for Bernie Sanders

Ever since Donald Trump became the presumptive Republican nominee for president, he's been focusing most of his attacks on his Democratic rival, Hillary Clinton, and imploring her challenger to enter the race as an Independent.

"Bernie Sanders is being treated very badly by the Dems," Trump tweeted on Monday. "The system is rigged against him. He should run as an independent! Run Bernie, run."

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'Run, Bernie, Run': Trump keeps imploring Bernie Sanders to mount a 3rd-party bid for president
NEW YORK, NEW YORK - APRIL 13: Attendees await the start of a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
NEW YORK, NEW YORK - APRIL 13: Attendees await the start of a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
Attendees hold signs in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
Natalia Plaza (L) and Suzanne Tufan, with their faces painted, wait for a campaign rally with U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders in Washington Square Park in the Greenwich Village neighborhood of New York, New York April 13, 2016. REUTERS/Brian Snyder
An attendee wears a t-shirt in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
An attendee holds a sign in support of Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, at a campaign event in New York, U.S., on Wednesday, April 13, 2016. Sanders stepped up his feud with General Electric Co., denouncing the manufacturer as 'greedy' and accusing Chief Executive Officer Jeffrey Immelt of not being truthful in responding to the attacks. Photographer: Victor J. Blue/Bloomberg via Getty Images
NEW YORK, NEW YORK - APRIL 13: Rosario Dawson speaks onstage at a campaign event for Democratic presidential candidate U.S. Senator Bernie Sanders (not pictured) at Washington Square Park on April 13, 2016 in New York City. (Photo by D Dipasupil/WireImage)
NEW YORK, NY - APRIL 13: Film director Spike Lee attends the Bernie Sanders rally in Washington Square Park on April 13, 2016 in New York City. (Photo by Mireya Acierto/FilmMagic)
MANHATTAN, NY - APRIL 13: U.S. Presidential candidate Bernie Sanders (I-VT) campaigns at Washington Square Park in Manhattan, NY, on April 13, 2016. (Photo by Yana Paskova/For The Washington Post via Getty Images)
U.S. Democratic presidential candidate Bernie Sanders addresses supporters at his campaign rally in Washington Square Park in the Greenwich Village neighborhood of New York City, April 13, 2016. REUTERS/Brendan McDermid
U.S. Democratic presidential candidate Bernie Sanders addresses supporters at his campaign rally in Washington Square Park in the Greenwich Village neighborhood of New York City, April 13, 2016. REUTERS/Brian Snyder
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Bernie Sanders, an Independent senator from Vermont, has had an impressive rise this election cycle, mounting a surprisingly tough challenge to Clinton. Although he's the longest-serving Independent member of Congress, he's been running for the Democratic nomination for president.

Trump has been pushing this message of Sanders being treated unfairly by the Democratic party for weeks.

"Bernie Sanders has been treated terribly by the Democrats -- both with delegates & otherwise," Trump tweeted in late April. "He should show them, and run as an Independent!"

Despite Trump's advocacy on Sanders' behalf, the real-estate mogul has dubbed him "crazy Bernie" in other tweets.

Sanders running as an Independent against Trump and Clinton would largely benefit Trump. Sanders, who has built up a significant amount of popular support, could win voters who might otherwise support Clinton.

RELATED: Celebrities who endorse Sanders

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'Run, Bernie, Run': Trump keeps imploring Bernie Sanders to mount a 3rd-party bid for president

Killer Mike of Run the Jewels 

The rapper has been very vocal within the hip-hop community about his endorsement of Sanders, and even introduced him at an Atlanta rally. 

Image via Getty

Danny DeVito 

In August 2015, the 'It's Always Sunny in Philadelphia' actor took to Twitter, saying, "Bernie Sanders...you're our only hope Obi-Wan Kenobi". 

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Mark Ruffalo

Ruffalo used Twitter to share his political stance on January 17th of this year, saying, "@BernieSanders is preferred 2-1 by young people because they know his means what he says."

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Susan Sarandon 

In June of last year, Sarandon posted a video titled 'Flashback: Rep. Bernie Sanders Opposes Iraq War' along with the caption "We need a leader who is courageous and levelheaded in times of crisis:Bernie Sanders ‪#‎Bernie2016‬.

The liberal activist has since been seen campaigning for Sanders in Portland, Maine and introducing him on the campaign trail. 

Image via Getty

Belinda Carlisle

Back in August of last year, the lead singer of The Go-Go's tweeted, "yes, I switched teams...my candidate!" above an announcement that Bernie Sanders would be joining CNN's State of the Union. 

Ever since then she has been an avid supporter on social media. 

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Justin Long 

The 'Dodgeball' actor introduced Bernie Sanders at a campaign event in Des Moines shortly before the Iowa Caucus. 

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Sarah Silverman 

Sarah Silverman was among other celebs who headlined a fundraiser for the presidential candidate at Hollywood’s Laugh Factory on January 26th. 

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George Lopez 

After tweeting "WATCHA I Am #feelingthebern. Today I'm proud to officially endorse @BernieSanders for President" late last year, the actor has made headlining appearances at Sanders' fundraising events. 

Image via Getty 

Spike Lee 

After citing his endorsement on a radio show recently, he elaborated on his commitment to Sanders, saying: “Bernie was at the March on Washington with Dr. King. He was arrested in Chicago for protesting segregation in public schools. He fought for wealth and education equality throughout his whole career. No flipping, no flopping. Enough talk. Time for action.”

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Trump more or less acknowledged this himself in tweets earlier this month:

"Get ready for November," Trump tweeted on May 11. "Crooked Hillary, who is looking very bad against Crazy Bernie, will lose!"

He said in a subsequent tweet: "I don't want to hit Crazy Bernie Sanders too hard yet because I love watching what he is doing to Crooked Hillary. His time will come!"

Both Trump and Sanders have railed on their respective party's nominating processes, calling them "rigged" to favor establishment candidates.

Allan Smith contributed to this report.

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