McCain associate invokes Fifth Amendment on Trump dossier sources: report
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An associate of Sen. John McCainJohn Sidney McCainListen, learn and lead: Congressional newcomers should leave the extremist tactics at home Overnight Defense: Trump unveils new missile defense plan | Dems express alarm | Shutdown hits Day 27 | Trump cancels Pelosi foreign trip | Senators offer bill to prevent NATO withdrawal Bipartisan senators reintroduce bill to prevent Trump from withdrawing from NATO MORE (R-Ariz.) invoked the Fifth Amendment in order to not testify before the House Intelligence Committee on a dossier of opposition research that claims ties between President TrumpDonald John TrumpDACA recipient claims Trump is holding ‘immigrant youth hostage’ amid quest for wall Lady Gaga blasts Pence as ‘worst representation of what it means to be Christian’ We have a long history of disrespecting Native Americans and denying their humanity MORE and Russia, according to Fox News.

The committee originally issued a subpoena for David Kramer — a former State Department official and current senior director of the nonprofit McCain Institute — in December. 

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Committee Chairman Devin NunesDevin Gerald NunesBlack Caucus sees power grow with new Democratic majority Nunes's 2018 Dem challenger launches voting rights group Democrats: Concentrate on defeating, not impeaching MORE (R-Calif.) had wanted to speak with Kramer about his visit to London in November 2016, during which he met with the author of the dossier, former British intelligence officer Christopher Steele. According to court filings, he met with Steele at McCain's request, to view “the pre-election memoranda on a confidential basis."

Kramer then traveled back to the U.S. and gave copies of the memos to McCain, who in turn handed the documents over to the FBI. 

The committee interviewed Kramer last month prior to issuing a subpoena for him. 

The dossier was contracted out to opposition research firm Fusion GPS and funded in part by Hillary ClintonHillary Diane Rodham ClintonIdentity politics and the race for the Democratic nomination O'Rourke’s strategy: Show Americans the real Beto Conservatives pound BuzzFeed, media over Cohen report MORE's campaign. 

President Trump has called the document "fake."

Republicans want to know if the document was used as the basis for a surveillance warrant on any members of the Trump campaign.

However, Democrats want to know if the salacious claims about Trump in the dossier, which connect him to Russia, are true.