A conservative group led by Stephen Bannon reportedly shopped around a document in 2015 linking President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE to mobsters in an attempt to undermine his campaign, CNN reported Monday.

The opposition research was developed by the Government Accountability Institute (GAI), which Bannon co-founded with Peter Schweitzer in 2012.

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The document reportedly details years of alleged deals between Trump companies and figures in organized crime.

"We research political figures from all political parties and our basic premise is follow the money. That's what guides our research approach," Schweizer told CNN.

The New York Times first reported about the document on Friday.

GAI is also backed by prominent GOP mega-donors the Mercer family, and Rebekah Mercer is listed as the group’s chairwoman on its site.

Bannon was backing Sen. Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) in the GOP primary at the time. Cruz mentioned Trump’s ties to organized crime as a reason Trump should release his tax returns during the campaign.

Bannon declined CNN’s request for comment.

Trump slammed Bannon as having “lost his mind” after comments Bannon made about Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE in a book about Trump’s White House first emerged.

Bannon is quoted in Michael Wolff's "Fire and Fury: Inside the Trump White House" as calling Trump Jr.’s meeting with a Russian lawyer “treasonous.”

"They’re going to crack Don Junior like an egg on national TV," Bannon said.

Bannon released a statement calling Trump Jr. a “patriot” and a “good man” on Sunday.

However, the White House rejected Bannon’s apology on Monday.

“I just don’t think there’s any way back at this point,” White House spokesman Hogan Gidley told reporters.