Trump dossier author's blackmail concerns

The former spy who wrote a dossier about Donald Trump's presidential campaign and Russia says his concern was "whether or not there was blackmail going on".

The former British spy who compiled a dossier of allegations about Donald Trump's presidential campaign and Russia brought the document to the FBI in July 2016 because he was worried about "whether a political candidate was being blackmailed," according to a congressional interview transcript.

California Senator Dianne Feinstein, the top Democrat on the Senate Judiciary Committee, revealed the transcript from an August closed-door interview with Glenn Simpson, a co-founder of the political opposition research firm Fusion GPS. The firm commissioned the dossier, which was initially paid for by a conservative website and then later by Democrats, including Hillary Clinton's presidential campaign.

In the transcript, Simpson said Christopher Steele took the dossier to the FBI and said his concern was "whether or not there was blackmail going on, whether a political candidate was being blackmailed or had been compromised".

The dossier is a compilation of memos written by Steele during the 2016 campaign that contained allegations of connections between Trump and Russia, including that Trump had been compromised by the Kremlin.

Trump has derided the dossier as a politically motivated hit job. Following his lead, several GOP-led committees are now investigating whether the dossier formed the basis for the FBI's initial investigations. Simpson has denied that it did and, according to the transcript, told investigators that the FBI told Steele that the government also had intelligence from "an internal Trump campaign source."

Simpson would not name the source.