Nick Clegg has called Boris Johnson a "conventional" politician who "treats his political ambition a bit like he treats his hair."
Clegg said the Mayor of London, who announced his intention to stand at the next General Election, liked to pretend he did not care about his appearance or career - but was actually "fixated" with them.
"The thing about Boris Johnson is despite all the kind of clumsiness and bumbliness, he's actually a really, really ambitious politician," the Deputy Prime Minister said on his regular LBC radio phone in.
"He wants everyone to think that he doesn't really care, but he actually really, really does care."
More top news
If you've ever wondered what the world looks like through the eyes of a child, look no further than the Instagram feed Things I have drawn.
The news was confirmed by Alex, who shared a picture of their three daughters looking at an ultrasound picture.
The Shadow Brexit Secretary said the government's reported 'sweetheart deal' with the car maker must be 'transparent and accountable'.