President Donald Trump says he will demand an inquiry into whether his election campaign was infiltrated for political purposes.
In a tweet, Mr Trump said he wanted to know whether his predecessor’s administration ordered such a move.
The request, which will be made officially on Monday, comes after US media reports suggesting the FBI had an informant meeting campaign aides.
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There is already an investigation into all aspects relating to the campaign.
Mr Trump’s demand came amid a series of tweets on Sunday denouncing a “witch hunt” that, he said, had found no collusion with Russia.
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