Mr Gyimah, who became the seventh Cabinet minister to resign since Mrs May’s Brexit agreement was unveiled, issued a stark warning to the Prime Minister. Describing the Brexit compromise as a “deal in name only”, Mr Gyimah said voting in favour of the agreement approved by the EU27 last Sunday would “set ourselves up for failure” by surrendering “our voice, our vote and our veto”. He added: “It has become increasingly clear to me that the proposed deal is not in the British national interest, and that to vote for this deal is to set ourselves up for failure.
“We will be losing, not taking control, of our national destiny.”
Mr Gyimah, tipped by many as a future Conservative party leader, said he was able to get a “foretaste” of the future master-servant relationship between the European Union and Britain when he was the minister responsible for Britain’s role in the Galileo system.
The EU announced the UK will be banned from using the Galileo satellite system for military purposes after Brexit, as it would give London insight into the bloc’s security information.
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This decision, Mr Gyimah said, should be a “clarion call” for the Prime Minister, signalling the EU will always try to put its interests first.
Mr Gyimah said: “I have seen first-hand the EU stack the deck against us time and time again.”
The former minister added the deal approved on Sunday is just a draft, since Brussels and London have left “so much to negotiate”, including a trade deal and a way to avoid a hard border between Ireland and Northern Ireland.
He continued: “With so much left to negotiate, we must take a clear-eyed view on the strength of our position.
“So far, the EU has been able to set the timetable, the sequencing and the hurdles to be cleared at each stage of Brexit, limiting our room for manoeuvre.
“In these protracted negotiations, our interests will be repeatedly and permanently hammered by the EU27 for many years to come.”
Upon resigning, the former minister refused to rule out a second referendum, as he believes Mrs May’s deal will damage the UK more than remaining within the bloc.
He continued: “Britain will end up worse off, transformed from rule-makers into rule-takers.
“At the end of the negotiations, Britain won’t be standing side by side with our European partners as equals.”
Mr Gyimah joins the 100 Tory MPs who publicly announced they will vote down Mrs May’s deal in Parliament on December 11.
The Prime Minister is currently in Buenos Aires to promote the “global Britain” she hopes her deal will shape.
On Friday, the president of the European Council, Donald Tusk, backed Mrs May’s plan, saying voting it down would leave Britain with just two choices, a no deal or no Brexit at all.