US Election 2016: Donald Trump's national political director 'steps back' from campaign

Jim Murphy, the national political director of Donald Trump, has stepped back from the campaign, according to the media reports.

"I have not resigned but for personal reasons have had to take a step back from the campaign," Murphy said. Murphy, who joined the Trump Campaign in June, did not specify any reason for this.

He is a close ally of Paul Manafort, Trump's former campaign chairman, having worked together on Bob Dole's 1996 presidential campaign, Politico said. Manafort had resigned from the campaign in August.