Britain's Queen Elizabeth has formally approved the law facilitating the UK's departure from the European Union at the end of this month.
The move means that Britain can finally leave the EU after years of bickering and three delays.
Speaker of the House of Commons Nigel Evans confirmed the European Union (Withdrawal Agreement) Act had received royal assent in a short announcement to the House of Commons.
Responding to the development, the Scottish National Party's Westminster leader Ian Blackford said: "This is a constitutional crisis."
"We are faced with a situation which is completely unprecedented when the government in Edinburgh, Belfast and in Cardiff has not given consent to this Act of Parliament, and that completely contravenes the devolution settlement that made it clear that the consent of the devolved administrations had to be given in Bills of Parliament that become Acts of Parliament that involve the devolved administrations," he told MPs.
"We find ourselves here today, that our parliament has been ignored, our government has been ignored and, against the expressed wishes of the people of Scotland that voted in the referendum and reaffirmed the right of the people of Scotland to determine their own destiny, that that has been ignored."
Mr Blackford asked what he has to do "to make sure that that mandate that the Scottish government has from the people of Scotland to have an independence referendum on our future, to make sure that Scotland has that right, to be a European country, to be an independent country".
He added: "There's a very clear message, I must say Mr Speaker, that has been delivered from this House - that the rights of the people of Scotland are to be shut down and we will have no part of it."
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Brexit Secretary Steve Barclay said on Twitter that "Her Majesty the Queen has now granted #RoyalAssent to the #BrexitBill which therefore becomes the #BrexitAct, Enshrined in law, this enables the UK to leave the EU on 31st Jan.".
Her Majesty the Queen has now granted #RoyalAssent to the #BrexitBill which therefore becomes the #BrexitAct. Enshrined in law, this enables the UK to leave the EU on 31st Jan. pic.twitter.com/hzv2o2bMfr
— Steve Barclay (@SteveBarclay) January 23, 2020
Yesterday, the House of Commons rejected all five amendments to the Withdrawal Bill proposed by the House of Lords. The government won all five votes with very large majorities.
UK Prime Minister Boris Johnson is expected to sign the instrument of ratification of the Withdrawal Agreement in the coming days.
President of the European Council, Charles Michel, and President of the European Commission, Ursula von der Leyen, will sign the instrument tomorrow morning.
They will then visit Albania and North Macedonia, two countries seeking to join the EU.
The European Parliament's constitutional affairs committee begins its consideration of the Withdrawal Agreement tomorrow afternoon, with a final vote expected on Wednesday 29 January in Brussels.
The UK will cease to be a member of the EU on Friday 31 January at midnight Brussels time - 11pm London time.
