The US House Intelligence Committee’s top Democrat has accused Republicans of tampering with a memo about claims of FBI surveillance at the 2016 election.
Adam Schiff said Republicans had changed the text after it was voted on.
The secret document was passed by the Republican-dominated committee but needs approval from President Donald Trump to be made public.
It is believed to accuse the FBI of abusing its surveillance powers to target the Trump campaign.
The four-page document was compiled by staffers for House Intelligence Committee head Devin Nunes, a member of Mr Trump’s Republican party.
Concerns about its contents were raised by the FBI itself which complained of “material omissions of fact that fundamentally impact the memo’s accuracy”.
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Democrats fear the document may be an attempt to discredit the inquiry into Trump campaign links to Russia, which is being led by Special Counsel Robert Mueller.
If Mr Trump gives his approval, the memo may be released later on Thursday.
What do we know about the memo’s contents?
It apparently accuses the Department of Justice (DoJ) and the FBI (Federal Bureau of Investigation) of abusing a programme known as the Foreign Intelligence Surveillance Act (FISA) during the presidential election campaign.
The allegation is that the FBI spied on a member of Mr Trump’s campaign on the basis of unproven accusations against Mr Trump known as the “Russian dossier”.
That dossier was compiled by former UK intelligence agent Christopher Steele with money financed in part from Hillary Clinton’s campaign.
Following his State of the Union speech on Tuesday night, Mr Trump was heard telling a Republican lawmaker he was “100%” for releasing the document.
BREAKING: Discovered late tonight that Chairman Nunes made material changes to the memo he sent to White House – changes not approved by the Committee. White House therefore reviewing a document the Committee has not approved for release. pic.twitter.com/llhQK9L7l6
— Adam Schiff (@RepAdamSchiff) February 1, 2018
