In July 1861 the Prussian king undertook a visit to the health resort at Baden-Baden and Franz Roggenbach took the opportunity to present his "Bundesreformplan" to the Prussian king. The plan appears to have been reviewed and in broad terms endorsed by key members of the Prussian government. The reactions of Prussia's recently appointed ambassador to the Russian empire, Otto von Bismarck was necessarily a written reaction, and it was positive with regard to the idea of a German state extending to the Swiss frontier and excluding Austria, although for some of Roggenbach's more detailed thoughts on the structures of a future Germany state, Bismarck's endorsement was notably more nuanced. Nevertheless, the new Prussian king was at this point widely celebrated as a champion of liberal causes, and it was easy to infer that in most important respects the ideas of the government in Karlsruhe - Roggenbach's ideas - were aligned with those of the Prussian government. In 1862, however, the Prussian king appointed Otto von Bismarck as his chief minister. In a letter he wrote to Robert von Mohl in October 1862 Roggenbach described Bismarck as an unprincipled Junker ("...für einen grundsaßlosen Junker"), a chancer ("...für einen waghalsigen Spieler") and a person without conscience ("...für einen gewissenlosen Mensch") interested only in maintaining his own power. It may have been an ungenerous assessment, but in it Roggenbach correctly acknowledged that with Bismarck in place, Prussia might still champion Prussian leadership for a united Germany, but she could no longer be regarded as a champion of liberal ideals. in the aftermath of the Schleswig-Holstein crisis Roggenbach resigned his ministerial offices suddenly in 1865. The resignation was attributed to "constitutional differences". When a new government was appointed in July 1866 Franz von Roggenbach was not a member of it.