Story highlights The platform committee is responsible for shaping the party's official policies

The Sanders campaign said Malloy and Frank cannot be trusted to perform their roles without bias

Washington (CNN) Bernie Sanders' campaign wants the Democratic National Committee to remove two Hillary Clinton supporters from key convention roles, accusing them of being "aggressive attack surrogates."

The campaign on Saturday announced that it had written the DNC and called for the removal of Connecticut Gov. Dannel Malloy, who is the co-chairman of the platform committee, and former Massachusetts Rep. Barney Frank, who leads the rules committee. The platform committee is responsible for shaping the party's official policies on a range of issues heading into the 2016 election season, and the rules committee shapes how the convention operates.

"Governor Malloy and Mr. Frank have both been aggressive attack surrogates for the Clinton campaign," Sanders campaign counsel Brad Deutsch wrote in a letter to the party's Rules and Bylaws Committee. "Their criticisms of Sen. Sanders have gone beyond dispassionate ideological disagreement and have exposed a deeper professional, political and personal hostility toward the senator and his campaign."

The Sanders campaign said Malloy and Frank cannot be trusted to perform their roles without bias.

"The appointment of two individuals so outspokenly critical of Sen. Sanders, and so closely affiliated with Secretary Clinton's campaign, raises concerns that two of the three Convention Standing Committees are being constituted in an overtly partisan way designed to exclude meaningful input from supporters of Sen. Sanders' candidacy," Deutsch said.

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