During preliminary coalition talks last week, Chancellor Angela Merkel's Union bloc and the Social Democrats agreed to "immediately" stop approving arms exports to countries involved in the conflict.
Ahead of a crucial vote by the SPD membership this weekend, which will decide whether the coalition deal can go ahead, Mrs Merkel said the success of the European Union required a stable German government.
Opponents of the talks within the SPD, especially members of the party's youth and left wings, are campaigning actively against further talks. He said the SPD - which posted its worst result since 1933 in the election - was likely to see further losses.
"The exploratory talks created a framework for what is possible and what isn't", he said. "Nevertheless, I ask everyone in my party to take responsibility: Please consider the consequences if this government option fails".
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Germany says it won't approve arms exports to countries involved in the conflict in Yemen, a move that could affect sales of military hardware to Saudi Arabia.
He said: "If the party reject a coalition it will lead to new elections, and fast".
Many experts fear that new elections could further strengthen the anti-immigrant, far-right Alternative for Germany (AfD), which entered parliament for the first time in September.
A negative vote by the SPD on Sunday would prolong political deadlock in Europe's largest economy, which has been without a government since the September 24 election that weakened both blocs.
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"I don't want the geriatric nurse to have to wait four years for better working conditions just so the SPD feels better", he said.
However the grand coalition is far from a done deal.
The SPD branch in that region wants a final coalition agreement to include a call to abolish Germany's dual public-private health insurance system in favour of a single citizen's insurance, to scale back temporary employment contracts and to allow family reunions for asylum seekers suffering unusual hardship.
A new poll by broadcaster ZDF showed that 64 per cent of Germans - and 75 per cent of SPD members - expect SPD delegates to approve further talks with Dr Merkel's conservatives.
Turkish military 'retaliates' against fire from Syrian Kurds
Turkey's military said the offensive , code-named Olive Branch , had been launched at 5 p.m. local time and was part of Ankara's right to self-defense.
"We'll still be talking about details - but basic things that are not already in the blueprint won't be added during coalition negotiations", Strobl told Funke media group.