Donald Trump has attacked special counsel Robert Mueller's investigation into Russian interference in the US presidential election he won in 2016.

He tweeted that the inquiry was unfair - and reiterated there had been "no collusion" between his election campaign and Russia.

He added that it was dominated by "hardened Democrats" and supporters of his defeated opponent Hillary Clinton.

Mr Mueller, a highly regarded former head of the FBI, is a Republican.

The president's comments came a day after his lawyer, John Dowd, said it was time for the special counsel's investigation to end. Initially Mr Dowd said he was speaking for the president but later clarified he was "speaking for myself".

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