Forty members of the Electoral College on Tuesday signed a letter demanding an intelligence briefing on Russian interference in the election ahead of their Dec. 19 vote.

Ten electors originally signed the letter when it was published Monday, and 30 more have since added their names.

The open letter — led by Christine Pelosi, the daughter of House Democratic Leader Nancy Pelosi (Calif.) — urged Director of National Intelligence James Clapper to give a detailed briefing on President-elect Donald TrumpDonald John TrumpWSJ: Trump ignored advice to confront Putin over indictments Trump hotel charging Sean Spicer ,000 as book party venue Bernie Sanders: Trump 'so tough' on child separations but not on Putin MORE's ties to Russia.

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“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,” the letter read.

The Clinton campaign applauded the effort Monday, saying it had repeatedly warned about Russian interference aimed at swaying the election in Trump’s favor.

“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. “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 signees of the letter are all Democratic electors, aside from one Republican: Chris Suprun from Texas.

Suprun has already pledged not to vote for Trump, and claimed last week that other Republican electors plan to pick an alternative, too.

Bipartisan efforts in Congress are underway to investigate the CIA’s conclusion that Russian interference swayed the election in Trump’s favor.

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSunk judicial pick spills over into Supreme Court fight Hillicon Valley: Trump's Russia moves demoralize his team | Congress drops effort to block ZTE deal | Rosenstein warns of foreign influence threat | AT&T's latest 5G plans On The Money: Trump 'ready' for tariffs on all 0B in Chinese goods | Trump digs in on Fed criticism | Lawmakers drop plans to challenge Trump ZTE deal MORE (R-Ky.) on Monday said the Senate Intelligence Committee should investigate the findings.

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