LOS ANGELES - Democratic presidential candidate Bernie Sanders on Friday threatened a floor fight over rules and platform planks at the party's summer convention, warning the Democratic National Committee not to stack the convention's standing committees with supporters of Hillary Clinton.

The prospect of a procedural wrench thrown into the party's flagship event is likely to cause headaches for Democratic leaders trying to forge a united front against Donald Trump, the likely Republican nominee.

Sanders has amassed some 9 million votes during the nation's primaries and caucuses, and has said even if he fails at getting the final nomination, he wants to shape the party's agenda on issues like wealth disparity, financial reform and the role of big money in politics. He says the standing committees that consider the party's platform and rules should reflect the number of votes he's received in the 2016 primaries and caucuses.

"I will not allow them to be silenced at the Democratic National Convention," Sanders wrote of his supporters in a letter to Democratic National Committee Chairwoman Debbie Wasserman Schultz.

The platform committee considers the party's stance on a wide range of policy issues, while the rules committee sets the guidelines governing the convention. Sanders' letter came after the candidate spoke with the chairwoman by phone earlier this week.

"If the process is set up to produce an unfair, one-sided result, we are prepared to mobilize our delegates to force as many votes as necessary to amend the platform and rules on the floor of the convention," Sanders wrote.

Luis Miranda, a spokesman for the Democratic National Committee, said "because the party's platform is a statement of our values, the DNC is committed to an open, inclusive and representative process. Both of our campaigns will be represented on the drafting committee, and just as we did in 2008 and 2012, the public will have opportunities to participate."

Clinton holds a sizable lead of more than 300 pledged delegates and has received about 3 million more votes than Sanders during the primaries. Including super delegates - the elected party leaders and officials who can choose the candidate of their choice - Clinton is more than 90 percent of the way to clinching the nomination.

In the letter, Sanders notes that Connecticut Gov. Dannel Malloy will be in charge of the convention's platform committee and former Massachusetts Rep. Barney Frank will run the rules committee. He calls both "aggressive attack surrogates on the campaign trail" for Clinton.

Sanders said he submitted the names of more than 40 people to serve on three standing committees and only three of his recommendations were selected by Wasserman Schultz. He said none of his supporters were assigned to the rules committee.

The Vermont senator has vowed to campaign through the end of the primary season in mid-June and advocate at the convention for his policy goals on addressing wealth inequality and overhauling the campaign finance system. He has also criticized states that do not allow independents to participate in Democratic contests or states that do not allow same-day registration.

Connecticut Democratic Party spokesman Leigh Appleby said that while Malloy endorsed Clinton and may have differences with Sanders on certain issues, "we are confident that the platform committee will come together behind a core set of values that unite us as Democrats."

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