The President of the European Commission faced a grilling by MEPs as he found himself being confronted over special tax deals made with large multinational companies.
Dubbed the Lux Leaks scandal, Jean-Claude Juncker was quizzed by MEPs over deals made with companies from 1989-2009.
Fabio Di Masi, a German MEP, claimed on Euronews that there was a relationship between Mr Juncker and deals agreed.
He said: “He was the architect and the godfather of this cartel.
The German MEP described Mr Juncker as the architect of tax-rulings
“You can see the example of when he took office the so-called tax-rulings which were a big topic after the so-called Luxembourg leaks exploded.
“There is clearly a relationship and he met personally, he even basically advertised himself in election campaigns in Luxembourg by saying ‘I was the on who attracted business here with our favourable tax environment’.”
The various deals with numerous big companies such as Pepsi, IKEA, AIG, Coach, Deutsche Bank, Abbott Laboratories and nearly 340 other companies were made during when Mr Juncker was firstly Minster of Finance if Luxembourg and later Prime Minister of Luxembourg.
The deals allowed many of the companies to slash their global tax bills.
He was the architect and the godfather of this cartel
Fabio Di Masi
Ana Gomes, a Portuguese MEP suggested that Mr Juncker would be useful in tracking down other member states over tax scandals.
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He added: “Sometimes you need a poacher to go after the poachers.
“Definitely he has people in the Commission who are working hard.
“And with the support of this parliament with the demand of this parliament, he can act, he should confront member states.”
MEPs have ordered Mr Juncker to explain his role in the scandal, which came to light when the deals were revealed by the International Consortium of Investigative Journalists.
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A European Commission spokesperson said: “The Juncker Commission has lead the crackdown on tax avoidance and tax evasion, putting the EU in the driving seat of global efforts in this field.
“President Juncker made this fight one of the central tenets of his campaign to become Commission President. We have more than delivered on this pledge. It's a priority in our political guidelines.
“We have made unprecedented strides to boost tax transparency and to close loopholes leading to large scale tax avoidance at EU level since this Commission took office.
“These are steps that would have been unthinkable just a few short years ago and without the political will and drive of President Juncker.”