LAWRENCE, Kan. (AP) - League of Women Voters chapters are trying to contact about 20,000 Kansans whose voter registrations are stalled because of problems proving their citizenship. The president of the Lawrence-Douglas County chapter says the work is slow because many of the potential voters do not answer telephone messages or emails from the organization. Kansas Secretary of State Kris Kobach contends it is easy for residents to prove their citizenship before voting. He says the law is necessary to prevent illegal immigrants from voting. Dolores Furtado, president of the League of Women Voters of Kansas, said the chapters are using various methods to help local election commissioners reach people whose registrations aren't complete.