The British foreign secretary insisted the UK will get a "great deal" in the negotiations
Boris Johnson has said the sums of money the EU is proposing to demand from Britain for Brexit "seem to be extortionate".
When asked in the House of Commons whether Brussels should be told to "go whistle" if it wants more money from Britain, the British foreign secretary said: "I think that the sums that I have seen ... seem to me to be extortionate.
He added: "I think go whistle is an entirely appropriate expression."
"Go whistle" is a phrase that means asking for something with little chance the request being granted.
The EU has put Britain's so-called "exit bill" at tens of billions of euros, partly to cover a share of future EU budget commitments made while it was a member.
Mr Johnson also said his government has not made any plans for a "no deal" Brexit because the UK will get a "great deal" in the negotiations.