After 1942, when Roosevelt was made aware of the Nazi extermination of the Jews by Rabbi Stephen Wise, the Polish envoy Jan Karski and others, he told them that the best solution was to destroy Nazi Germany. At Casablanca in 1943 Roosevelt announced there would be no compromise whatsoever with Hitler. In May 1943 he wrote to Cordell Hull (whose wife was Jewish): "I do not think we can do other than strictly comply with the present immigration laws." In January 1944, however, Morgenthau succeeded in persuading Roosevelt to allow the creation of a War Refugee Board in the Treasury Department. This allowed an increasing number of Jews to enter the U.S. in 1944 and 1945. It also financed Swedish diplomat Raoul Wallenberg's work in Budapest, where he and others helped to save 100,000+ Jews from deportation to death camps. By this time, however, the European Jewish communities had already been largely destroyed in Hitler's Holocaust. The US chose not to bomb Auschwitz or other concentration camps, despite arguments from some officials that this could slow the killing of Jews there (see Auschwitz bombing debate).