Hilary Clinton said it is inexplicable and shameful" (Picture: PA).
Former US presidential candidate Hillary Clinton has criticised the delay in the release of a report examining Russian influence in British politics.
The House of Commons was previously told a report by the Intelligence and Security Committee (ISC) was sent to the Prime Minister for approval on 17 October.
There has been no indication of the exact contents of the report, it will assess the threat posed by Moscow to Britain's democratic processes following an 18-month inquiry into illicit Russian activities in Britain.
The Sunday Times previously claimed nine Russian business people who have donated money to the Conservative Party were named in the dossier.
Former Attorney General Dominic Grieve, who has seen the report, has stressed its publication is essential ahead of the General Election, as it contains information "germane" to voters.
In an interview with BBC Radio 5 Live, Ms Clinton said the delay was unacceptable given the upcoming election, referencing the proven Russian interference in the 2016 US election.
"I find it inexplicable that your Government will not release a Government report about Russian influence. Inexplicable and shameful. You're having an election," she said.
"People deserve to know what is in that report. We had a somewhat similar problem in 2016."
A report into Russian interference in the US presidential election in 2016 found illegal interference from Moscow occurred in a "sweeping and systemic fashion", according to special counsel Robert Mueller.
Ms Clinton stressed the importance of the UK security report being made public before the General Election to allow voters to make informed decisions.
"[Donald] Trump and his campaign were under investigation for their connections with Russia, and Russians, and Russian cutouts and Russian agents, and others promoting Russian interests," Ms Clinton said.
"And the public didn't know before the election. And I would hate to see that happen here. Whatever the outcome.
"I don't know what's in it, any more than anybody else does. But certainly, people who are about to vote in a month or so deserve to know what is in a report that one has to speculate must have something of concern, otherwise, why wouldn't it be publicly disclosed?"
Mr Grieve, Chairman of the ISC, has accused the PM of sitting on the report ahead of the 12 December General Election.
Transport Secretary Grant Shapps and a Downing Street spokesman have said the machinery of Government is the reason for the delay in publication.
Mr Shapps said that while he was not close to the report, the delay is "just the usual way that purdah works" and incumbent governments are not allowed to publish anything controversial in the run-up to an election.