Brexit minister Dominic Raab said Theresa May's plan threatened the integrity of the United Kingdom.
Britain's Brexit minister Dominic Raab resigned on Thursday in protest at Prime Minister Theresa May's deal for leaving the European Union.
"I regret to say that, following the Cabinet meeting yesterday on the Brexit deal, I must resign," he said in a statement on Twitter.
Raab said May's plan threatened the integrity of the United Kingdom.