On last night's Real Time With Bill Maher, a talk show that airs weekly on HBO, the guests included Piers Morgan and Australian comedian Jim Jefferies.

Towards the end of the programme, Maher asked whether people who said during the US election campaign that Hillary Clinton was the "lesser of two evils" should apologise, in light of president Donald Trump's executive orders to build a wall between the US and Mexico, and implement a travel ban on people from seven Muslim-majority countries.

As the clip below shows, that's when it all kicked off.