Ebert on 14 June asked Karl Trimborn (Zentrum) who accepted but apparently signalled that he might be working only as a negotiator. Trimborn managed to gain the SPD's acceptance of a minority government based on Zentrum, DDP and DVP that the Social Democrats would support from outside until the Spa conference in July. After that date further cooperation between SPD and the government would depend solely on the latter's actions. Both DDP and DVP agreed in principle to such an arrangement and as early as 14 June, Constantin Fehrenbach was named as possible Reichskanzler. However, in a conversation between Ebert and Fehrenbach on 15 June, the latter said he did not feel up to the job and suggested instead. Mayer refused on 16 June and on 17 June Ebert asked Fehrenbach to form a cabinet.