In the summer semester of 1930, Barth moved to Bonn. He was soon drawn into a conflict with German nationalists about the German pacifist and theologian Günther Dehn, whom Barth defended. A few months after Adolf Hitler’s appointment as Reich Chancellor in 1933, Barth wrote Theological Existence Today!, declaring that church and theology constitute a boundary for every state, even a totalitarian one. At the same time, Barth’s domestic situation grew more difficult, leading him to consider divorce. In 1934 Barth co-authored the Barmen Theological Declaration of the Confessing Church. Barth didn’t conform with even minor regulations at the university and refused to swear the loyalty oath to Hitler without an addendum. This led to Barth’s suspension as professor, followed by a disciplinary criminal process, in which Barth protested that Hitler was treated as a second God. The process led to Barth’s compulsory retirement in 1935.