BERLIN (Reuters) - Senior members of Germany’s Social Democrats (SPD) said on Saturday they were confident the party would approve the start of formal coalition talks with Chancellor Angela Merkel’s conservatives at a special congress this weekend.

Martin Schulz, leader of Germany's Social Democratic Party (SPD), inspects the convention hall prior to the SPD's one-day party congress in Bonn, Germany, January 20, 2018. REUTERS/Wolfgang Rattay

The upbeat comments came after the SPD’s biggest regional branch in North Rhine-Westphalia recommended its members to vote in favor of entering negotiations, on condition that party leader Martin Schulz pushes for more concessions on labor, health and migration policies.

Around 600 SPD delegates vote on Sunday on whether their leaders should press ahead with talks on renewing an alliance with the conservatives that has governed Germany since 2013.

The two groups struck a preliminary deal last week but Schulz is facing a strong backlash from the SPD’s left and youth wings, which argue that the blueprint does not bear enough of the party’s hallmarks.

They say the SPD would be better off in opposition after last year scoring its worst election result since Germany became a federal republic in 1949.

Schulz defended the preliminary deal.

“Toll-free day care facilities for children, a strong Europe and decent care of the elderly - that will only happen when we join the government,” Schulz said in a tweet.

“To seize the opportunity to considerably help many people is a duty for me,” Schulz added.

SPD parliamentary leader Andrea Nahles said she still expected formal talks to happen.

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“I expect a majority to back coalition negotiations,” Nahles told Welt am Sonntag newspaper. “Nevertheless, I ask everyone in my party to take responsibility: Please consider the consequences if this government option fails.”

Speaking to reporters in Bulgaria, Merkel said she hoped the SPD would approve the start of formal coalition talks.

“We will wait for the SPD party congress and then hopefully start coalition talks,” Merkel said.

ROOM FOR MANEUVER?

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 Sept. 24 election that weakened both blocs.

Possible scenarios then would include new elections or a minority government for what would be the first time in Germany’s post-war era.

SPD General Secretary Lars Klingbeil told regional newspaper Neue Osnabruecker Zeitung he expected the delegates to approve the start of coalition talks.

“The SPD knows very well what it wants, what it does not want and what is good for the people in the country,” he said.

Michael Groschek, leader of the SPD’s biggest regional branch in NRW, said he also expected a positive outcome, though the final coalition deal would “for certain” have to look different from the blueprint.

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 favor of a single citizen’s insurance, to scale back temporary employment contracts and to allow family reunions for asylum seekers suffering unusual hardship.

Merkel’s conservatives and leading business associations have urged the SPD delegates to back coalition talks, saying a rejection could plunge the country into a severe political crisis.

But Thomas Strobl, party deputy of Merkel’s Christian Democrats (CDU), rejected the SPD’s latest demands for more policy changes to be included in the final coalition deal.

“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.