Donald Trump is considering "terminating" Robert Mueller, the special counsel investigating possible collusion between Mr Trump's 2016 campaign team and Russia, a friend of the president has said.

The former FBI director was appointed to the role last month with a remit to look at possible Russian meddling in the 2016 election, and "related matters".

"I think he's considering perhaps terminating the special counsel. I think he's weighing that option," Newsmax CEO Chris Ruddy told "PBS NewsHour".