All-night talks yet to bear fruit as many SPD rank and file call for any deal with Angela Merkel to be rejected.
A deal on health care and labour reforms are needed to prevent Germany from facing a second election within four months.
Talks have made progress but differences over labour and healthcare remain
German Chancellor Angela Merkel arrived on Sunday for what many hope are her last round of talks with the Social Democrats.
Germany is inching closer toward forming a new government. The Social Democrats led by Martin Schulz narrowly voted on Sunday to start talks with Angela Merkel's Christian Democrats.
If talks go well, Merkel could begin her fourth term as Chancellor by April.
This is the Brief from Brussels, a roundup of the top stories from the EU's de facto political capital.