The Free Democratic party, led by Christian Lindner, 38, has angrily condemned fiscal leeway from Germany to troubled eurozone countries like Greece and even France.
Mr Lindner, Chancellor Angela Merkel’s ally turned rival, made it clear under his stewardship, clear lines would be drawn in the sand for the French.
He said: “My impression is that Mrs Merkel has already agreed with Mr Macron to set up new money pots and transfers in Europe for the time after our election.”
Adding: “Euro countries must be responsible for their own fiscal policy.”
The FDP also opposed bailouts for Greece and has criticised Mrs Merkel for her willingness to hand out money to troubled eurozone.

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Mr Lindner has made it clear that he wants to implement stricter rules as he forges ahead.
He said: “We have too little competitiveness in the eurozone.
“The general view is more public investment needs to be mobilised, but we have enough money for that.
“The problem is the order of the markets, the lack of flexibility, the over-bureaucratisation in many places.
“Eurobonds, new pots of money… that doesn’t make any sense.
“If there is a lack of investment, then you can think about it, but if you take on new debt together for consumption, that would overstretch solidarity in the eurozone.”
Ahead of the next election on September 24, Mrs Merkel is under pressure to secure enough seats for a strong coalition.
Her Christian Democrat Party coalition is likely to need propping up – and Mr Linder said a deal is not out of the question after the election.
But he thinks that a three-way government led by Mrs Merkel with the Free Democrats and the Green party would “not be a realistic goal”.
Polls predict that the FDP is set to take third place in the federal election. It could determine who takes power with Mrs Merkel if she wins her fourth term as German Chancellor, Bloomberg reports.
Mrs Merkel’s CDU-CSU declined one percentage point to 37 and the Social Democrats, her main opponent, rose one point to 23 per cent an Infratest Dimap poll published on Wednesday showed.
But the FDP are keen to tell the electorate that they would lead differently to the current chancellor.
The party wants Greece to be kicked out of the eurozone in exchange for the debt being wiped out.