More Democratic electors are joining the call for an intelligence briefing on Russian interference in the presidential election before they cast their votes for president on Monday.

Twenty-nine electors now are pressuring Director of National Intelligence James Clapper to disclose more information about the CIA’s conclusion that Russian interference helped sway the election in President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s favor.

On Monday, 10 electors — spearheaded by Christine Pelosi, the daughter of House Democratic Leader Nancy Pelosi (Calif.) — wrote an open letter to Clapper, demanding more information ahead of next week's vote.

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“The Electors require to know from the intelligence community whether there are ongoing investigations into ties between Donald Trump, his campaign or associates, and Russian government interference in the election, the scope of those investigations, how far those investigations may have reached, and who was involved in those investigations,” the letter reads. “We further require a briefing on all investigative findings, as these matters directly impact the core factors in our deliberations of whether Mr. Trump is fit to serve as President of the United States.”

Twenty-eight Democrats and one Republican have now signed the letter.

On Monday, the Clinton campaign voiced support for the effort.

“Each day that month, our campaign decried the interference of Russia in our campaign and its evident goal of hurting our campaign to aid Donald Trump,” said John Podesta, Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's campaign chairman, in a statement. “Despite our protestations, this matter did not receive the attention it deserved by the media in the campaign. We now know that the CIA has determined Russia's interference in our elections was for the purpose of electing Donald Trump. This should distress every American.”

The Washington Post reported last week that the CIA concluded Russian interference helped Trump win the election. On Monday, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) joined bipartisan efforts to further investigate the findings, saying the Senate Intelligence Committee should investigate the CIA's assessment.

“We’re going to follow the regular order. It’s an important subject and we intend to review it on a bipartisan basis,” he said.