The leader of the British opposition Labor Party, Jeremy Corbyn, said yesterday that he has a secret government report revealing that there will be customs duties between Northern Ireland and the mainland of Britain under the Brexit agreement, which Prime Minister Boris Johnson negotiated.

"This is the shocking and definitive evidence that categorically shows the detrimental impact of Johnson's exit agreement on large parts of our country," Corbin said in a speech in London.

The main message of Johnson's campaign ahead of next week's elections focuses that he will implement the exit agreement three years after the 2016 referendum, but Corbyn said this slogan is misleading.

He said that the Prime Minister wanted the British to vote without seeing things as they were, adding that the leaked government document revealed that there will be customs duties and security checkpoints between Britain and Northern Ireland, adding that this contradicts Johnson's claim that there will be no borders in the Irish Sea. The Labor Party’s plan to exit the European Union calls for a new agreement that includes a customs union to be negotiated, and another referendum on whether to approve the agreement is held, although Corbyn said he would stand neutral.