Lumumba with Resident minister. The leader of the National Congolese movement party, Patrice Lumumba (right) with Belgium Congo resident Minister Walter Ganshof van Der Meersch. Lumumba was ousted when he admitted he had failed in his mission to find a broad majority to form a national union government. Instead Abako (lower Congo) party leader Joseph Kasavubu became the Belgian Congo's first Premier designate when he was charged to form a national government 'on the broadest places possible' 18 June 1960