London (CNN) Hillary Clinton has described the UK government's failure to publish a report on alleged Russian interference in British politics before December's general election as "inexplicable and shameful."

In the UK on a book tour, the 2016 Democratic US presidential candidate said the government should release the report to give voters a full picture of how Russia seeks to influence western democracies.

"I'm dumbfounded that this government won't release the report about Russian influence because every person who votes in this country deserves to see that report before your election happens," Clinton told the BBC on Tuesday.

The unpublished report by the Intelligence and Security Committee (ISC) is at the center of a storm in the UK.

CNN reported last week that the ISC heard warnings that Russia's influence reaches deep into the British establishment and not enough had been done to counter the threat. One witness described Russian influence as "potentially the most significant threat to the UK's institutions and its ways of life," according to written testimony reviewed by CNN.

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