Former Secretary of State Nicky Morgan accused Boris Johnson of a “dereliction” of duty and his increased pressure on May with fresh Brexit intervention is “undoing” the Conservative Party and leading Jeremy Corbyn to Downing Street.
The ex-cabinet minister lashed out at the Foreign Secretary for setting out his own Brexit “red lines”, which opposed May’s agenda and showed no regard for the financial security of millions of Brexit supporters.
Ms Morgan, writing in The Independent, said: “The UK Government should be focusing on getting the UK out of the EU in the least damaging way, not debating arbitrary red lines set down to try to curry favour with those who want a utopian ultra-free trade, low tax, minimal regulation state.
“Those who are pushing this agenda have no place in a responsible government – it is a dereliction of the duty to act in the national interest. And it has to stop.”
The backlash also emerged elsewhere, with Tory MP Simon Hart taking to Twitter after Mr Johnson’s interview to say: “Have I missed something or has Boris Johnson suddenly been given some new role and authority in all this?”
Remain-backing Tory MP Anna Soubry said on Twitter: "Nicky Morgan and Ruth Davidson talking much sense.
"People are fed up with Tory wars and Brexit mixed messages. Boris Johnson must grow up or go."