"We are truly headed for the status of a colony - and many will struggle to see the economic or political advantage of that particular arrangement," Johnson said in a resignation statement.

Earlier on Monday, Johnson became the third government official to walk away from the government over Prime Minister Theresa May's soft Brexit plan which has angered many Conservatives.

Johnson also stated in the letter that, by "surrendering control over our rulebook," the UK will make it "much more difficult to do free trade deals." What is most disturbing, he said, is that the unacceptable plan laid out by May is the country's "opening bid."

"This is already how we see the end state for the UK - before the other side has made its counter-offer," he wrote. "It is as though we are sending our vanguard into battle with the white flags fluttering above them."

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