Joe Biden has reignited his feud with Donald Trump, telling him it was time to grow up and act like an adult.

The vice-president, responding to how the president-elect has communicated over the transition of power via Twitter, said in an interview with PBS: "Grow up Donald, grow up, time to be an adult, you're president. You gotta do something, show us what you have.

"You're gonna propose legislation, we're gonna get to debate it, let the public decide, let them vote in Congress, let's see what happens. It's going to be much clearer what he's for and against and what we're for and against."

Mr Trump has repeatedly voiced scepticism over the intelligence agencies' allegations that Russia interfered in the presidential election, and now threatens to pare back and restructure the CIA.