After Admiral Darlan's assassination, Giraud became his "de facto" successor with Allied support. This occurred through a series of consultations between Giraud and Charles de Gaulle. De Gaulle wanted to pursue a political position in France and agreed to have Giraud as commander-in-chief, as the more militarily qualified of the two. Giraud took part in the Casablanca conference, with Roosevelt, Churchill and de Gaulle, in January 1943. Later, after very difficult negotiations, Giraud agreed to suppress the racist laws, and to liberate Vichy prisoners from the South Algerian concentration camps. Henri Giraud and Charles de Gaulle then became co-presidents of the French Committee of National Liberation and Free French Forces. Giraud wanted to lift all racial laws immediately; however, only the Cremieux decree was immediately restored by General de Gaulle. De Gaulle consolidated his political position at Giraud's expense because he was more up to date with the political situation. Giraud went to the U.S. in July on a useless trip while de Gaulle gained strength. Giraud made a fool of himself in Detroit with a speech praising Nazi achievements in Germany.