 In 1966, he testified before the International Court of Justice in support of South Africa's apartheid system.In another article, from 1965, he criticized the Immigration and Nationality Act of 1965, which replaced an immigration system largely excluding Asians and discriminating against southern and eastern Europeans with a race-neutral program based on skills and family connections to U.S. citizens and permanent residents, which enabled an increase in immigration from Asia.Van den Haag instead advocated greater rather than less immigration restriction.