Theresa May has said she will still oppose the Government's controversial Internal Market Bill, despite Boris Johnson's concessions to Tory rebels over new powers to break international law.
Mrs May accused the Prime Minister of behaving “recklessly and irresponsibly”, and said a compromise between Downing Street and a group of sceptics led by Sir Bob Neill did not go far enough.
Mr Johnson has conceded that Parliament may have a say before proposed ministerial powers to break international law are used.
But Mrs May said while she recognised Sir Bob has made "every effort" to come to a compromise, "it makes no difference as to whether a decision to break international law is taken by a minister or by this Parliament - it is still a decision to break international law"
Speaking in the House of Commons yesterday, Mrs May said: "I cannot emphasise how concerned I am that a Conservative Government is willing to go back on its word, to break an international agreement signed in good faith and to break international law.".
"One of the great strengths we have as a country is our commitment to the rule of law and this will have been damaged.
“Our reputation as a country that stands by its word will have been tarnished, and the willingness of other countries to trust the United Kingdom and its values will have been reduced. So much for global Britain."
Mrs May said it would also have an impact on the UK's trade talks, adding: "The Conservative Party upholds the rule of law, it's one of our values, one of our characteristics, yet we're being asked to tear up that principle and throw away that value.”
She concluded that she cannot support the bill at its second reading, but did not say whether she will vote against it or abstain.
The UK Internal Market Bill would allow the Government to breach the Withdrawal Agreement to allow the creation of goods checks on the Northern Irish border with the Republic of Ireland.
Mr Johnson has said the bill is crucial to allow the free flow of food if Britain leaves the EU without a deal on January 1, and to maintain the relationship between Northern Ireland and the rest of the UK.
The controversial bill has already led to the resignation of Lord Keen, the Scottish advocate general, who said he could not reconcile the legislation with his commitment to obeying international law.