The chairman of the Philadelphia 2016 Host Committee for this summer’s Democratic National Convention said supporters of presidential candidate 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 have to “behave themselves” when the Vermont senator loses the nomination.

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During a radio interview with John Catsimatidis, Ed Rendell, a former Pennsylvania governor and Democratic National Committee chairman, laid out his vision for how the convention would play out.

“I think it’s gonna be a great convention, but of course the key to it is the Sanders people. Bernie’s gonna have his name placed in nomination; we’re gonna have a roll call; there’s gonna be a demonstration in support of Bernie; he’s gonna lose the roll call,” he said. “His supporters have to behave and not cause trouble. And I think they will, and I think Sen. Sanders will send them a strong message.”

Sanders is trailing Democratic front-runner 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 by 774 total delegates. Clinton is just 155 delegates from clinching the nomination.

--This report was updated at 11:22 a.m.