Speaking on BBC Radio 4’s Today programme, the Islington South and Finsbury MP talked about Labour’s amendment to ensure tariff-free access to the single market.
“She [Mrs May] has talked about having the fullest possible access to the single market, unimpeded by tariffs and red tape – we agree with her – and that’s the vision that we have.
“But she also has an alternative vision where she said that if she didn’t get the deal that she wanted… she said we would be free to set competitive tax rates and embrace the policies that would attract the world’s best companies and biggest investors to Britain.
Emily Thornberry has called for Theresa May to "bring the UK" with her while negotiating Brexit
Yes, the public have voted to leave but they have not voted for the contradictory ideas Theresa May has
“We would be free to change the basis of Britain’s economic model.”
But Ms Thornberry argued Leave voters “certainly haven’t voted for her to break the British economic model”.
She also called for the Government to release “regular reports” on its Brexit progress.
“We want the best deal and if Theresa May loses face because she’s got the wrong deal that doesn’t have the support of Parliament – tough,” she said.
Government Loses Brexit Vote Appeal
Tue, January 24, 2017
Britain's most senior judges ruled that Prime Minister Theresa May does not have the power to trigger the formal process Article 50 for the UK's exit from the European Union without Parliament having a say.
Get Quotes on Home Insurance
1 of 12
Issued by the Supreme Court of (top row, from the left) Lord Neuberger, Lord Mance, Lord Kerr, Lord Sumption, (bottom row, from the left) Lady Hale, Lord Clarke, Lord Wilson and Lord Hodge, who agreed with the majority decision that the Government could not trigger Article 50 without Parliamentary approval.
“What we also want to have is regular reports so she can gauge the opinion of the house so that she brings the house with her, so that she brings the country with her, so actually, she has a stronger hand.
“So when she goes to Europe she can say ‘I speak on behalf, not only the tiny percentage of the 52 per cent but on behalf of the nation’. And if she brings Parliament with her in those negotiations, it makes her position stronger.”
Ms Thornberry remained optimistic about Labour’s amendments despite host Mishal Husain reminding her of those criticising her party’s move.
She said: “We will be doing everything that we can to ensure we get these amendments because she has to be the Prime Minister, that does not have a democratic mandate to do whatever she likes with our country.
“Yes, the public have voted to leave but they have not voted for the contradictory ideas Theresa May has and we certainly haven’t voted for her to break the British economic model.”