Schäuble to Selmayr: Please stop tweeting | EPA Schäuble to Selmayr: Stop meddling (and don’t tweet!) The German finance minister is still irked that the top European Commission aide called a Greek proposal ‘good basis for progress.’

The blame game over who scuttled the Greece negotiations was on full display Monday, as the endless crisis entered what is sure to be a tumultuous week.

Commission President Jean-Claude Juncker blamed Greek Prime Minister Alexis Tsipras.

Tsipras blamed his nation's creditors.

And German finance minister Wolfgang Schäuble blamed... well, he blamed not only the Greeks but also Juncker's top aide, Martin Selmayr.

In an extraordinary meeting of his Christian Democratic Union (CDU) group in the German parliament late Monday afternoon, Schäuble called Selmayr a meddler, two sources present in the meeting told POLITICO. They wanted to be unnamed because the group meetings are private.

Schäuble complained that Selmayr was involving himself in issues that should have been above his pay grade as Juncker’s chief of cabinet, accusing him of what translates as violating rules that govern the division of responsibility. “Kompetenzwidrige Einmischung” that is, in the punchy German legalese which Schäuble is a master of.

A more American translation would be, “sticking his nose where it doesn't belong.“

Gunther Krichbaum, chairman of the Bundestag committee on European affairs, joined Schäuble in calling a tweet by Selmayr an “unbearable interference,” the sources said.

What had Selmayr done? The German, a CDU member, had tweeted out that one of the countless Greek proposals for a deal had finally arrived, in the evening of June 21, calling the paperwork “a good basis for progress.”

New Greek proposal received by @JunckerEU, @Lagarde, @ecb. Good basis for progress at tomorrow's EuroSummit. In German: "eine Zangengeburt". — Martin Selmayr (@MartinSelmayr) June 21, 2015

That was emphatically contradicted by Schäuble the next day: “The situation for me is the same as on last Thursday,” Schäuble told the press, blaming “unauthorized people” for communicating on the creditors‘ behalf rather than naming Selmayr.

According to the sources in the room, the tweet unnecessarily took pressure from the Greek side, encouraging them to go all out in sticking by their negotiating position during the week. Schäuble and other finance ministers, who would have to pick up the bill of the Greek bailout, were much more cautious.

Juncker himself indirectly backed Selmayr on Monday, telling reporters: “Mine is a political Commission, this is why, in spite of some member states’ resistances, I have wanted to play a role on Greece.”