Voters in the Electoral College will not receive an intelligence briefing about Russian meddling in the U.S. presidential election, according to a new report.

Sources told NPR the electors would not receive any national intelligence before they cast ballots this Monday.

Fifty-four of the 232 Democratic electors had signed a letter asking for a briefing before the Electoral College’s vote, according to reports.

The letter asked Director of National Intelligence James Clapper for information on what role, if any, Russia had in helping 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.

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“Separate from Mr. Trump’s own denials of Russian involvement in the election, the confirmed communication between Trump’s aides and those associated with the Russian election interference activity raise serious concerns that must be addressed before we cast our votes,” the message reads.

Ten electors originally signed the letter when it was published Monday. The effort was organized by Christine Pelosi, the daughter of House Minority Leader Nancy Pelosi (D-Calif.).

Subsequent signees have all been Democrats, except for Republican Chris Suprun of Texas.

Suprun has already pledged not to vote for Trump and claimed last week that other GOP electors plan to pick an alternative too. Faithless electors, though, are a rare occurrence in the Electoral College and the overwhelming majority of Republicans are expected to back Trump.

The electors' letter came after reports that the CIA concluded that Russian hackers were trying to help Trump win the election. On Friday, the FBI also said it backed the CIA's conclusions on Russian interference.

Democratic presidential nominee 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 had also applauded the electors' call for a briefing.

“Despite our protestations, this matter did not receive the attention it deserved by the media in the campaign,” Clinton campaign chairman John Podesta said in a statement Monday about Russian interference. “We now know the CIA has determined Russia’s interference in our election was for the purpose of electing Donald Trump. This should distress every American.”

Trump has fiercely rejected reports Russia boosted his campaign as “ridiculous,” portraying them as “another excuse” from Democrats disappointed by his win.

This story was updated at 5:54 p.m.