Trump news - live: President rages over impeachment hearing, escalates Iran tensions on Twitter and names ASAP Rocky 'hostage negotiator' as national security chief

Donald Trump - visiting California for fundraisers and a trip to his US-Mexico border wall – has lashed out at the House Judiciary Committee's impeachment hearings against him, calling them “the greatest political scam in US history!” at the start of a chaotic day on Twitter.

The president also announced he would be increasing sanctions on Iran and named Robert O’Brien as his new national security adviser to replace John Bolton, the State Department diplomat last heard from attempting to intervene as a “hostage negotiator” when US rapper A$AP Rocky was detained in Sweden and charged with assault.

Mr Trump’s ex-campaign manager Corey Lewandowski could meanwhile be held in contempt of Congress over his stonewalling before the Judiciary panel on Tuesday, a tense hearing in which he refused to answer questions, appeared to admit lying to the media, promoted his website during a bathroom break and was told his behaviour was “completely unacceptable”.

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