Donald Trump has backtracked on his promise to imprison Hillary Clinton in his first televised interview since becoming president-elect, insisting that he is a “sober person” who will prioritise healthcare, tax reform and immigration.

Mr Trump appeared on CBS News show 60 Minutes on Sunday night, accompanied by his four adult children and wife, Melania.

He used the interview to reiterate his belief that he knows more about Islamic State of Iraq and the Levant (Isil) than America’s military chiefs, and announce that he would not be taking the $400,000 salary that comes with the presidency.

He also spoke of his reaction upon election, and once again praised President Barack Obama.