Julia Hartley-Brewer challenged Barry Gardiner MP over what Labour would have done in the ongoing deadlock in Brexit negotiations.
Theresa May has flown out to Brussels to meet with Michel Barnier and Jean-Claude Juncker in a bid to break the stalemate in the withdrawal talks.
It was announced no significant process had been made on the issues of citizen rights, the Irish border, and the financial settlement - which the EU requires in order to advance onto discussions about trade.
Gardiner, the MP for Brent North and shadow minister for international trade, said the "worst concession" made by the Brexit Secretary had landed the talks in this situation.
He told Julia Hartley-Brewer: "Shall I tell you the worst concession? It was made by David Davis on the fifth morning of the whole negotiations when he agreed to the chronology of the timetable.
"I would criticise the EU, because they are holding to ransom the second phase of the talks where you can’t determine – for example the situation of the Irish border – unless you have clarity of what the trading arrangements will be.
“On day one, when David Davis agreed to make progress on the border issues, a precondition of talks about the final deal, that was a mistake."
Our host challenged him on what Labour would have done in this situation, and a row erupted after she told Gardiner he couldn't criticise unless he provided an alternative solution.