The Government is to appeal a High Court ruling that might allow parliament to stop Brexit.
Campaigners are celebrating a victory in a legal challenge that saw judges rule that only parliament could vote to trigger to Article 50, causing a huge disruption for plans for Britain to leave the EU. But the Government is already planning to have the decision reversed, in an appeal at the Supreme Court.
Within minutes of the ruling by Lord Chief Justice Lord Thomas, International Development Secretary Liam Fox told the House of Commons that the Government will appeal to the Supreme Court.
And a Government spokesman said: "The Government is disappointed by the Court's judgment. The country voted to leave the European Union in a referendum approved by Act of Parliament. And the Government is determined to respect the result of the referendum.
"We will appeal this judgment."
Labour MP and constitutional expert Graham Allen said the Supreme Court now faces "its first historic test" in hearing the Government's appeal against the ruling.
He said: "It is the beginning of defining more clearly and honestly a separation of powers in the UK, which has hitherto been shrouded in mystery.
"Parliament can no longer be the poodle of Government of any political complexion.
"On fundamental matters of our democracy, Parliament must not only be consulted but, as on Article 50, legislate.
"This is not to overturn the decision in principle by the British people but to give it full life.
"I welcome the decision of the High Court and now hope the Supreme Court upholds the sovereignty of Parliament which was such a core part of the reason to leave the EU."
Additional reporting by agencies
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