US President Donald Trump has accused his French counterpart Emmanuel Macron of being “nasty” for saying Nato was “brain dead”.

Mr Trump is in London for a summit marking the Western military alliance’s 70th anniversary.

The US president said Nato served a great purpose, and Mr Macron’s remarks had been “very insulting”.

He also said he could see France “breaking off” from Nato, but did not explain why.

However, at a joint press conference with Mr Macron later, Mr Trump struck a warmer tone, stressing that the two countries had “done a lot of good things together as partners”.