Mandić led an NDH government delegation to Sarajevo in late April 1944. There, he was presented with a memorandum documenting the persecution of Muslims by the Ustaše. Croatian politicians quickly condemned the memorandum, calling it "one of the greatest Muslim assaults...on the sovereignty and unity of the NDH." In March 1945, Mandić called for NDH citizens of all ethnicities to voice their thoughts on the Ustaše, the war and the communist Yugoslav Partisans. With his backing, the NDH drafted a memorandum to British Field Marshal Harold Alexander, Commander-in-Chief Middle East and commander of the 18th Army Group in Tunisia, expressing a desire to defect to the Allies in the wake of Hitler's death. The memorandum was ignored.