Doggett supports a guest worker program for undocumented immigrants. The effectiveness of guest worker programs has been a source of disagreement among scholars. In contrast, Kolbe was a strong supporter of guest worker programs for immigrants. He favors a strong immigration border policy and a guest worker program. In the United States there have been efforts at guest worker programs for many years. It has also been argued that guest worker programs can help control immigration. A large proportion of the guest worker population came from Turkey, Yugoslavia, and Pakistan. The immigration reform that Fox sought included a guest worker plan. Craig supported the guest worker program proposed by President George W. Bush. He supports Guest Worker programs and giving immigrants access to Social Security. These groups have advocated a new guest worker program that satisfies their interests. For Mexican Americans, opportunities for employment were largely limited to guest worker programs. Guest worker programs also allow migrant workers to legally and securely cross the border. Mozgovoy was a guest worker, employed as a cook in Saint Petersburg.