London
Local newspaper reported that Gyimah called the Brexit deal "naive" and said any deal struck with Brussels will be "EU first".
The Conservative MP has become the seventh member of the Government to quit since May unveiled the draft Withdrawal Agreement.
Gyimah said the plan was "not in the British national interest" and that voting for it would "set ourselves up for failure" by surrendering "our voice, our vote and our veto".
He said that May should not rule out holding a second referendum, a local media reported.
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