Trump Russia ties: How did reports of 'compromising' information emerge?

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A billboard showing a pictures of US president-elect Donald Trump and Russian President Vladimir Putin is seen through pedestrians in Danilovgrad, Montenegro, 16 November 2016.Image source, Reuters
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Donald Trump says Moscow has "never tried to use leverage on me"

Reports that Russia's intelligence agencies hold compromising material about Donald Trump have sparked angry denials from the US president-elect and the Kremlin.

The claims that Mr Trump's presidential campaign secretly communicated with Moscow - and that Russia has embarrassing sexual information about him - are unverified.

But there have been allegations circulating in political and media circles for months. Here is what we know about how they came to light.

October 2016

The Democratic leader in the US Senate, Harry Reid, provoked speculation when he accused FBI director James Comey of withholding "explosive information" on 30 October.

In a letter, Mr Reid said the information related to "close ties between [Republican candidate] Donald Trump, his top advisers, and the Russian government".

"The public has a right to know about this information. I wrote to you months ago calling for this information to be released to the public."

He hit out after the FBI revealed it was investigating emails linked to Hillary Clinton, and accused the bureau of violating an act that bars officials from influencing the election.

Image source, AFP
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Harry Reid said the FBI director was withholding "explosive information"

His letter came less than two weeks before the 8 November poll.

A day later the US news magazine Mother Jones, external published the first report alleging the existence of memos compiled since June by "a former senior intelligence officer for a Western country who specialized in Russian counterintelligence".

The BBC also first saw the documents in October, but has been unable to verify the information included.

However, the BBC learned in November that the CIA was treating the information as "credible". The author of the dossier is understood to be a former British intelligence agent.

The original intention of the research was to derail Mr Trump's candidacy, reports say.

December 2016

Image source, EPA
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Republican Sen John McCain, centre, has been a fierce critic of Donald Trump and a leading voice calling for sanctions against Russia over alleged hacking

Republican Senator John McCain became aware of the 35-page dossier and passed a full copy to the FBI director on 9 December, according to media reports.

By this time Mr Trump had won his surprise victory in the US election and was facing increasing pressure over claims Russian hackers had targeted Democratic Party emails.

Mr McCain confirmed on Wednesday that he had received sensitive information and turned it over to the FBI.

In a statement, he said he examined the contents of the material, was unable to make a judgment about the accuracy and delivered it to James Comey.

"That has been the extent of my contact with the FBI or any other government agency regarding this issue," he said.

Can US election hack be traced to Russia?

January 2017

US broadcaster CNN, external reported on 10 January that US intelligences agencies had presented the information - in the form of a two-page synopsis - to the president-elect, to President Barack Obama and to several congressional leaders.

The briefing happened a week earlier and was intended to make Mr Trump and President Obama aware of the allegations circulating, according to the report.

The synopsis was attached to a classified US report into alleged Russian hacking, CNN says.

But this was only shared with the highest level of government and was not included in the intelligence report about Russian hacking that was more widely distributed.

Following the CNN report, Buzzfeed News published the full dossier.

It said it was doing so "so that Americans can make up their own minds about allegations about the president-elect that have circulated at the highest levels of the US government".