Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE says Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE should run for president as an independent.

“Bernie Sanders has been treated terribly by the Democrats—both with delegates & otherwise,” Trump tweeted Tuesday. “He should show them, and run as an Independent!”

Bernie Sanders has been treated terribly by the Democrats—both with delegates & otherwise. He should show them, and run as an Independent! — Donald J. Trump (@realDonaldTrump) April 26, 2016

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Trump, the GOP's front-running cancdiate, has long compared himself to Sanders, arguing that both are outsiders treated unfairly by establishment forces.

The talk of an independent bid by Sanders, while extremely unlikely, harkens back to Trump's previous threats to mount his own independent bid, which would likely seal the election for the Democrats. Trump first raised that possibility last summer in an exclusive interview with The Hill.

The billionaire businessman has long complained about how he's been treated in the race and floated the same rationale for his own hypothetical independent bid.

Sanders, however, has an inherent disadvantage because the vast majority of Democratic superdelegates will likely pledge their support to rival Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE, making it that much more difficult for the Vermont senator to win the party's nomination. Although Sanders has run a tough challenge against Clinton, she also holds a substantial lead among pledged delegates won through the primary process thus far.

Trump is leading the delegate chase among Republicans, but finds himself facing the prospect of a contested convention with an outcome that is far from certain. The first ballot is seen as his best shot; Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE and John Kasich have found success wooing the loyalties of delegates bound to Trump on the first ballot.

—Ben Kamisar contributed to this report, which was updated at 12:39 p.m.