(CNN) If Sen. Bernie Sanders wins the Democratic Party's nomination in 2020, he plans to halt all corporate donations to the party's convention next summer. This as party leaders actively court donors for millions of dollars to pay for the event scheduled to take place next July.

The pledge from Sanders is part of a multi-prong campaign finance reform package rolled out by the presidential candidate while he recovers in Burlington, Vermont, from a heart attack suffered last week during a campaign event in Nevada.

"Our grassroots-funded campaign is proving every single day that you don't need billionaires and private fundraisers to run for president," Sanders wrote in the press release for the plan.

"We've received more contributions from more individual contributors than any campaign in the history of American politics because we understand the basic reality that you can't take on a corrupt system if you take its money."

The tough stance by Sanders sets the stage for a potential showdown with the Democratic National Committee and threatens to completely upend the way the made for television nominating contests are produced. The conventions, no longer a substantive deliberation by party delegates to pick a nominee, have largely become scripted coronations in glitzy sports arenas. The events, by both parties, are heavily funded by large corporations who may contribute limitlessly to the production because it falls under a soft money designation in the Federal Election code.

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