Donald Trump: It's a witch hunt against me
Donald Trump has told his Twitter followers they are witnessing the "single greatest witch hunt in American history".
The US President did not clarify what he was referring to in the early morning tweet, although he has frequently described reports about possible ties between members of his campaign and Russia as a "witch hunt".
He wrote: "You are witnessing the single greatest WITCH HUNT in American political history - led by some very bad and conflicted people! #MAGA" - the acronym of his campaign slogan, Make America Great Again.
Earlier, Mr Trump tweeted that a new report suggesting that special counsel Robert Mueller may investigate him for possible obstruction of justice after he sacked FBI director James Comey is a "phony story".
He said: "They made up a phony collusion with the Russians story, found zero proof, so now they go for obstruction of justice on the phony story. Nice."