Donald Tusk has warned Theresa May to not let her “emotions get out of hand” following her sensational attack on Brussels officials from the steps of Downing Street.
The president of the European Council said that Brexit negotiations were “difficult enough” without the two sides taking aim at each other.
It comes after Mrs May accused European bosses of trying to sway the result of the British election in a bombshell statement yesterday.
She claimed some bureaucrats want Britain’s Brexit negotiations to fail and have timed smears to deliberately affect British voters before they head to the polls on June 8.
But Mr Tusk took to Twitter today to warn talks could become “impossible” if the leaders become too emotional.
He said: “Brexit talks difficult enough. If emotions get out of hand, they'll become impossible. Discretion, moderation & mutual respect needed.”
#Brexit talks difficult enough. If emotions get out of hand, they'll become impossible. Discretion, moderation & mutual respect needed.— Donald Tusk (@eucopresident) May 4, 2017
Mr Tusk elaborated on his tweets in a short press conference this afternoon, stating: “We must keep in mind that in order to succeed we need discretion, moderation, mutual respect and a maximum of goodwill.”
His comments have been met with fury on social media and from politicians. Former Tory leader Iain Duncan Smith told the Telegraph: "If Donald Tusk wants to say any more on this he should simply direct any comments he has to Juncker. We could all do without the patronising finger-wagging of unelected politicians in Brussels."
Mrs May shocked Europe when she deliberately pointed the finger at President of the European Commission Jean-Claude Juncker in Wednesday’s speech.
She said: “In the last few days, we have seen just how tough these talks are likely to be. Britain’s negotiating position in Europe has been misrepresented in the continental press.
“The European Commission’s negotiating stance has hardened. Threats against Britain have been issued by European politicians and officials.
“All of these acts have been deliberately timed to affect the result of the general election that will take place on 8 June.”
The speech came shortly after the Prime Minister visited Buckingham Palace to officially dissolve Parliament.
On Monday reports appeared in the German press detailing the dinner held between President of the European Commission Jean-Claude Juncker and Theresa May a week ago.
The pair were there for talks on the upcoming negotiations of Britain leaving the EU.
Juncker is said to have described Mrs May as delusional following the meeting and on “living in another galaxy” over the speed at which she wanted to resolve EU citizens rights.
He is alleged to have said he left London feeling “10 times more sceptical” about the success of Brexit.
Mrs May said: “The events of the last few days have shown that - whatever our wishes, and however reasonable the positions of Europe’s other leaders - there are some in Brussels who do not want these talks to succeed.”
She insisted earlier this week talks with Mr Juncker had so far had been constructive.
Turning her focus to the upcoming election she said that only she could deliver the “strong and stable” leadership Britain needs to provide economic growth, and said a vote for Jeremy Corbyn would herald a “coalition of chaos”.
She said: “With me you will get strong and stable leadership, and an approach to Brexit that locks in economic growth, jobs for our children and strong finances for the NHS and the country’s schools.”