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Boris Johnson shut down a live TV interview “pub quiz” after appearing to become lost for words when asked to name the South Korean president.

The Foreign Secretary appeared to squirm before fleeing the Sky News interview, telling host Dermot Murnaghan “we are not getting into a pub quiz about leaders around the world”.

The presenter launched into the unexpected quiz live on TV, asking Mr Johnson the same questions he had fired at the Shadow Foreign Secretary, Emily Thornberry, in September.

He asked Mr Johnson to name the French Foreign Minister and the president of South Korea.

Mr Johnson said: “If you want to have a pub quiz, Dermot, I’ll be very happy to meet you in the pub.

“But the French foreign minister is mon ami, Jean-Marc Ayrault”.

But the bungling ex-Mayor of London appeared to be tongue-tied when asked who is the South Korean leader.

After a pause Mr Johnson said: “We are not getting into a pub quiz about leaders around the world and I’m going to, with great respect, invite you out to the pub, Dermot, so that we can take these conversations further.

“I have a terrible feeling that if I keep answering you, you will keep coming back with more.

“Have a good morning, see you.”

He then appears to move away from the camera.

Labour politician Emily Thornberry accused Mr Murnaghan of sexism after the presenter fired questions at her.