German conservatives under likely next chancellor Friedrich Merz vowed on Monday to move quickly to try to form a coalition after winning the most votes in a national election that saw far-right and far-left parties gain support from disaffected voters.

"The members have the final say," said party chairman Lars Klingbeil. "The members will make the final decision." Klingbeil is expected to take on leadership of the SPD's much reduced parliamentary group on Wednesday before representing the party in coalition talks with the CDU.

German conservative leader Friedrich Merz, the country's presumptive next chancellor, has again ruled out cooperating with the far-right Alternative for Germany (AfD) after Sunday's parliamentary election.