Slippery slope argument
According to Discovering the World through Debate, a slippery slope argument is "An argument that connects a series of events in a causal chain that ultimately leads to disaster or calamity. Slippery slope arguments are fallacies if the series of events is improperly connected" (249).
Trapp, Robert, et al. Discovering the World through Debate: A Practical Guide to Educational Debate for Debaters, Coaches, and Judges. Third Edition. New York: IDEA Press Books, 2005.