What do you think Trump said about the mayor of london?
He called him a loser who's doing a bad job, pointing out that crime is on the increase in London. Trump pointed out that Khan should not be insulting the elected leaders of allies, which is absolutely true.

"I don't think he should be criticizing a representative of the US" Why not. He doesn't say why... because it's a retarded thing to say and there is no why.
It's obvious why. I'll ask you, why does Trump need to go into intricate detail about what he thinks of a plonker who takes pot shots at him in order to boost his flailing popularity? He's on a state visit and has better things to talk about, such as trade.

He did not answer the question because being a fucking retard, he didn't even understand the goddamn question!
So it's his fault the dumb newswoman incorrectly clarified who she was talking about? He asked her directly if she's referring to the Mayor of London, and she said "yes". Why aren't you calling her a retard?