Lord Charlie Falconer, who served as justice secretary under Tony Blair, has said the legislation will cause serious damage to the UK in the future.
He said: “This bill damages the UK’s reputation for upholding the law and fosters divisions between the four parts of the UK. It is a terrible bill.
“The government works in a way that says it doesn’t care about the law, it sees the law as a downside, it acts like it’s too smart for the law.
“They don’t know the damage they are causing to the functioning of the country.
“If you can’t trust the law, who is going to trust us?”
“Are the citizens of this country going to trust the government if they don’t care about the law?”
JUST IN: Brexit LIVE: Boris has 24 hours to respond to EU legal action
As a result of these changes to the Withdrawal Agreement, which was signed in October, the EU has announced it will take legal action against the UK.
The President of the European Commission, Ursula von der Leyen, said: “The Commission has decided to send a letter of formal notice to the UK government.
“This is the first step in an infringement procedure.
“The letter invites the British government to send its comments within a month.
“The Commission will continue to work hard for a full and timely implementation of the Withdrawal Agreement.”
There are also fears that the bill could take power from Westminster.
In the United States, Democratic candidate Joe Biden also warned that a trade deal between the United States and the United Kingdom would be blocked if the Good Friday agreement was violated.
British officials, however, said the purpose of the legislation was to keep trade between the four decentralized nations.