The Congressional Black Caucus is against eliminating superdelegates, putting the group at odds with Democratic presidential candidate Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE.

In a letter first reported by Politico, the CBC also said it is against allowing independents and Republicans to vote in Democratic primaries.

Both suggestions have been championed by the Sanders campaign.

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"The Democratic Members of the Congressional Black Caucus recently voted unanimously to oppose any suggestion or idea to eliminate the category of Unpledged Delegate to the Democratic National Convention (aka Super Delegates) and the creation of uniform open primaries in all states," says the letter.

It was sent to both Democratic presidential campaigns, as well as to Senate Minority Leader Harry Reid Harry Mason ReidGraham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' Senate Republicans signal openness to working with Biden MORE (Nev.), House Minority Leader Nancy Pelosi (Calif.) and Democratic National Committee Chairwoman Debbie Wasserman Schultz.

“We want to participate as delegates and that's why this superdelegates system was created in the beginning, so members would not have to run against their own constituents,” said Chairman G.K Butterfield.

Superdelegates have been a flashpoint in the Democratic primary, pitting supporters of Sanders against those backing presumptive Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE.

The state Democratic Party in California on Sunday called for the elimination of the use of superdelegates, according to the Los Angeles Times.

Among those supporters of the resolution was Pelosi's daughter. Pelosi endorsed Clinton ahead of the Golden State's primary earlier this month.