Trump news - live: President rages over Mueller in Fox News-inspired Twitter storm, amid impeachment push and bid to force tax returns release

Donald Trump has warned that the antifacist movement Antifa could be declared a terrorist organisation and branded the Mueller investigation a “witch-hunt hoax” in a series of late-night tweets.

As the prospect of a push in congress for his impeachment grows, the US president’s tirade comes after a US House judiciary committee asked a judge to force the release of grand jury evidence from the special counsel's wide-ranging probe.

The request, filed on Friday, explicitly referenced congress’ impeachment powers and is a major step forward in the Democrats' legal fight against Mr Trump.

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Meanwhile, California Governor Gavin Newsom is reportedly on the verge of a move that could force Mr Trump to release his tax returns if he wants to appear on the state’s ballot in the 2020 elections.

Earlier on Saturday, Mr Trump was widely-criticised for a series of tweets accusing Democratic congressman Elijah Cumming of being a “brutal bully” from a “rat-infested district”.

The attacks appeared to have been inspired by a Fox & Friends report that aired minutes before the president’s outburst, which criticised living conditions in Mr Cummings’ district.

Nancy Pelosi led Democratic representatives in defending Mr Cummings, accusing the US president of “racist attacks”.