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Solov would not reveal which members of the Mercer family were investors.

“I can’t say more than ‘the Mercer family,’ ” Solov told the Standing Committee of Correspondents, the group tasked with approving credentials that grant reporters access to certain areas in the Capitol restricted to the general public. “That’s all I can specify right now.”

Solov also said that the site’s former executive chairman, White House senior strategist Stephen Bannon, resigned from the company in a phone call after the election.

But Solov said he could not provide documentation of Bannon’s separation from Breitbart.

Neither White House officials nor a spokeswoman for Breitbart and the Mercers returned requests for comment.

The Los Angeles-based Breitbart News, founded in 2007, has been criticized for airing inflammatory stories about immigrants and refugees and promoting nationalist views. Bannon once touted it as a “platform” for the alt-right, a movement whose adherents are known for espousing racist, anti-Semitic and sexist points of view.

Breitbart is one of many projects that the Mercers undertook with Bannon in the past six years as they expanded their political influence on the right.

The family’s profile started to rise in 2010, when Robert Mercer became co-chief executive of the Renaissance Technologies hedge fund and began directing his wealth into Republican campaigns. Last year, he and his wife, Diana, gave nearly $3.4 million to Trump’s campaign, the Republican Party and a family super PAC that backed the businessman’s presidential bid and was run by Kellyanne Conway, now a top White House adviser.