The veteran Temperate MP snapped at the host from German broadcaster Deutsche Welle forceful him to “stop interrupting” as the pair clashed over Brexit.
Speaking on DW Communication, the British reporter, Tim Sebastian, quizzed Mr Duncan Smith about how the UK is approaching Brexit talks with the European Weld.
Mr Duncan Smith explained how Brexit would unfold, insisting that the coming relationship between the UK and EU had to immediately be discussed.
He said: “Let me tell you something definitely important that Mr Barnier knows, that you cannot settle the pecuniary position of both the EU and the UK until you have completed what our relationship is afterwards.
Iain Duncan Smith rowed with the drove explaining how Brexit talks would unravel
“He knows this to be a actuality.”
The host interjected asking how many trade deals Mr Duncan Smith had negotiated which liberal the Tory raging.
He replied: “Let me tell you something, I know a bit more close by trade deals than you.
“Let me tell you something about trade deals. A close interrupting and let me tell you about trade deals you might learn something, here is what has to befall.
“As we leave the European Union, we will also re-enter the WTO as a voting colleague, we are a member but we are not a voting member.
Stop interrupting and let me tell you about barter deals you might learn something
“The lists that are owned by the EU actually have a financial tag to them.
“Unless they to with us the amount of money that we pay to take some of those plans relevant to us and lodge them at the WTO, they will end up as the EU, spending a great act more money for less potency.
“Here’s the point, they possess to settle that, they have to settle that at the time we hand down. Otherwise, they pick up a bigger bill.
“Mr Barnier knows terribly well that until this is settled, nothing is settled. The prestige is what is our relationship with the EU because it informs what the financial village is between us and the EU and it completes that.”
David Davis has vowed to “get down to manage” as intense negotiations with the European Union continue in Brussels.
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Mr Davis and the EU’s Brexit negotiator Michel Barnier refused to plea questions at a press conference before talks began on Monday morning.
Mr Barnier spoke reporters needed to «wait three days» because he would not be bailiwick any questions until Thursday.
The Frenchman said: “I look forward to our agreements this week. We will now delve into the heart of the matter. We distress to examine and compare our respective positions in order to make good elevation.
“As you know, our negotiating groups will work on citizens’ rights, on the fiscal settlement and other separation issues. Our co-ordinators will engage in a factious dialogue on Ireland, and they will work on the enforcement of the Article 50 contract.”