Martin Selmayr, the current secretary-general of the EU Commission, has faced widespread criticism over his fast-track promotion into the prestigious Brussels’ job as Mr Juncker’s personal aide.
The German national was promoted twice within a span of 10 minutes, with critics accusing him of breaking the law.
Officials say he “stretched and possibly even overstretched the limits of the law” in order to attain his status, suggesting several laws were infringed.
On Thursday night, Mr Selmayr was accused of “planetary-scale arrogance”, calling the situation “embarrassing” as he denied the accusations and said that “no laws” were broken.
Mr Selamyr, who Mr Juncker refers to as “The Monster” for his ruthlessness, reportedly told the Daily Mail: “Resign? I think resignations are for other people.”
When asked if he thought the situation was embarrassing, he said: ‘I don’t think it is very embarrassing at all.
“I think the European Union is in a strong position. We have a very good system for selecting senior officials.”
He then added: “The European Union is on the basis of law and we’ll continue to be on the basis of law.
“I’m a very qualified lawyer, that’s why I feel very confident. The European Commission has broken no laws.”
This comes after Emily O’Reilly, the independent European Ombudsman, lashed out at the European Commission for fast-track promoting, insisting their responses to allegations were “defensive” and evasive”.
She called for a new mechanism for appointing the secretary-general post after officials were accused of “maladministration”, and declared the move had destroyed the public’s trust in the Commission.
Ms O’Reilly said the Commission showed either ‘” lack of self-awareness” or “a wilful refusal to admit to them”.
Tory MEP David Campbell Bannerman said: “Mr Selmayr’s comments are planetary-scale arrogance. This represents the rotten core of the EU.”
Fellow Tory MEP Daniel Hannan added: “No one takes the blame. No one resigns.
“It’s precisely that kind of arrogance that people were voting against [when they voted for Brexit].”
Mrs O’Reilly’s report ruled discrepancies between the administration and his political alliance to Mr Selamyr, who was previously appointed as his chief of staff.
The report said Mr Selamyr’s promotion was “created artificially”, after the German was quickly appointed into EU’s most senior civil service position.
The report added: “And all of this in a context where the proposed appointment of a new secretary-general was not on the meeting agenda and no background papers had been circulated.”
In response to the report, EU’s commissioner in charge of staffing, Gunther Oettinger said: “While we do not share all aspects of the underlying report, we welcome that the Ombudsman neither contests the legality of the appointment procedure of the Secretary-General, nor the choice of the candidate.
“On some aspects, where the Commission has a different factual assessment, we will provide further information to the Ombudsman in due course.”