A House Democrat is calling for a delay in the Electoral College vote, currently set for Monday, until electors receive an intelligence briefing on Russia's interference in the presidential election.

Rep. Don Beyer (Va.) became the third Democratic lawmaker to back giving electors access to intelligence about how Russia tried to influence the election. The Washington Post reported over the weekend that the CIA has concluded the Kremlin's efforts were aimed at helping 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 defeat Democratic 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, rather than merely stoke chaos in the American election.

"I believe that Electors should be given all information relevant to this interference before they make their decisions and before they cast their votes," Beyer said Wednesday in a statement on Facebook.

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"Congress must take whatever action is necessary to protect the integrity of our democracy. I call on the leaders of Congress to delay the date of the vote for the Electoral College until an intelligence briefing has been given to each Elector," Beyer added.

Trump has rejected the CIA's conclusion, calling claims of Russian interference a "conspiracy theory."

Beyer joins Rep. David Cicilline (D-R.I.) in supporting the idea that electors should have access to intelligence agencies' findings. Rep. Jim Himes (D-Conn.), a member of the House Intelligence Committee, called Trump's response to the findings "completely unhinged" and urged the Electoral College to vote for someone other than Trump.

"The electoral college must do what it was designed for," Himes wrote on Twitter.

At least 40 of the 538 electors have requested an intelligence briefing before the Dec. 19 vote, which is expected to officially certify Trump's win. Clinton's campaign chairman, John Podesta, said earlier this week that he supports the effort.

All but one of the letter's signees is a Democratic elector, with the exception of a Republican from Texas who has already announced he won't vote for Trump.

Despite the pressure, the vast majority of Republican electors are still expected to cast their votes for Trump.