Emily Thornberry, the Labour MP, refused to reveal whether they would fight for certain amendments the party plans to make to the Brexit bill.
Speaking on The Andrew Marr Show, the host quizzed the 56-year-old politician over how Labour will react if they do not get the amendments on the bill they wish to get.
Last week the House of Commons debated and voted on the first bill for Article 50, which will allow Theresa May to begin the Brexit process by the end of March.
Parliament is set to debate the bill again as the opposition party prepare to make amendments shaping it as much as they can.
Andrew Marr smashed Emily Thornberry for her stance if their amendments are not accepted
However, Mrs Thornberry was blasted by Marr in a explosive rant as the presenter criticised her for suggesting the party would vote for Article 50, regardless of whether their amendments are accepted or not.
Marr asked if the amendments which Labour are set to propose, including conversations being allowed between parliament over Brexit negations, as well as tariff free access to the single market, are red lines.
Mrs Thornberry said: “We need to make sure throughout the negotiations we are ensuring these things happen.”
However, Marr, who had already interrupted the Labour MP as he was confused over whether they were red lines for the party or not grilled her back.
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It is totally illogical if you do
He said: “Without this for you for the Labour party, this is a catastrophic process?”
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The Labour politician fumed as she admitted that they were not the governed and had to resign over some aspects as they try to amend the bill.
She said: “No, I think the difficulty with the negotiations is that it is a question of give and take it will be a process happening over the next two years.”
Marr then quickly snapped back indicating that the MP was backtracking as he argued that: “These weren’t really red lines.”
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Theresa May insisted that she will trigger Article 50 by the end of March
“No no no, these are things that we need to make sure that we achieve,” Mrs Thornberry snapped back.
Marr finally attempted to pinpoint Labour's approach to whether these amendments would leave the party if they failed to achieve them.
He said: “So my question is very clear, if you don’t get what you want to achieve, do you vote in favour of Article 50 anyway, because it is totally illogical if you do.”
The Labour MP finished by accepting that in her view the party would “not frustrate Brexit”.
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