"What we have so far is not a workable basis for a decision," Steinbrueck was quoting as saying to Deutschlandfunk radio."We can't make decisions that are irresponsible on a completely inadequate basis."
General Motors' German brand Opel last week announced it sent a viability plan to the local government, asking for 3.3 billion euros ($4.15 billion) in state aid. Chancellor Angela Merkel earlier this year said the government is willing to help ailing automakers but, in exchange of state funds, interested companies must submit rescue plans to demonstrate their viability.
GM Europe President Carl-Peter Forster said in late February that Opel is keen to preserve jobs in Germany and avoid closing plants but government aid is necessary given the "exceptionally weak economic situation". Opel currently employs around 25,000 people in Germany.
"We will work with our labor representatives to find the best way forward in mitigating the societal impact of the restructuring, but it should be made clear that we need all three parts of the plan to be viable – the structural cost reductions, government support and GM support. Anything short of this will not result in a viable operation," he said.
Opel hasn't commented on the government's announcement, so we're still waiting for an official statement from the German automaker.