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The leader of the free world reacted “impatiently” last night to confirmation by Theresa May that Britain will have a two-year transition deal with Brussels before leaving the EU.

The source said: “The President told me ‘They’ve got it all to play for. We can give them [the UK] the best deal but I’ve got to be around to do it’.”

Mrs May’s deal will see Britain remain under EU control until 2021, two years after formally quitting the bloc.

However, this will overlap with US elections in 2020 which Mr Trump has no guarantee of winning.