Russian operatives claim to have compromising personal and financial information about United States president-elect Donald Trump, according to reports.

The information includes allegations of long contact between Mr Trump and Russia, and claims of sexual acts perpetrated by the President-elect in Moscow.

All allegations are yet to be corroborated by media and intelligence agencies.

CNN reported that both Mr Trump and outgoing President Barack Obama were presented with this intelligence recently, as part of a report on Russia’s interference with the US election.

The CNN report cited multiple US officials with “direct knowledge of the briefings”.

Mr Trump branded the reports as “fake news”.

FAKE NEWS – A TOTAL POLITICAL WITCH HUNT!

— Donald J. Trump (@realDonaldTrump) January 11, 2017

The information was presented to Mr Trump and Mr Obama as a two page synopsis added to a report about Russian involvement in the US election.

The two-page synopsis was in part drawn from 35 pages of memos compiled by a former British intelligence operative which US officials consider credible, CNN reported.

The memos are based on information from Russian sources and have been fully published by Buzzfeed.

It must be stressed that all the allegations are unverified, particularly the allegations published by Buzzfeed.

Those memos include allegations that Russia has been aiding Mr Trump for years, that Mr Trump’s aides have been in touch with Russia operatives and graphic claims of sexual acts.

CNN wrote that the FBI is investigating the credibility and accuracy of the memo’s allegations.