In an administration known for its shock value, this week we had perhaps the most un-shocking news since Donald Trump returned to the White House: his falling out with the world's richest man, Elon Musk.

The break-up of this big billionaire bromance came over what the president has labelled his big beautiful bill, which cuts taxes and boosts spending for border security and defence. Musk called it a "disgusting abomination" that would increase the US budget deficit and saddle Americans with what he called 'crushing' debt. 

And then the war of words went nuclear.