 Genscher was one of the FDP's driving forces when, in 1982, the party switched sides from its coalition with the SPD to support the CDU/CSU in their Constructive vote of no confidence to have incumbent Helmut Schmidt replaced with opposition leader Helmut Kohl as Chancellor.The reason for this was the increase in the differences between the coalition partners, particularly in economic and social policy.The switch was controversial, not least in his own party.