The possibility of a sequel had long been discussed, and Devlin once stated the world's reaction to the September 11 attacks influenced him to strongly consider making a sequel to the film. Devlin began writing an outline for a script with Emmerich, but in May 2004, Emmerich said he and Devlin had attempted to "figure out a way how to continue the story", but that this ultimately did not work, and the pair abandoned the idea.
In October 2009, Emmerich said he once again had plans for a sequel, and has since considered the idea of making two sequels to form a trilogy.
"Independence Day 2 is nowhere. It’s back and forth, back and forth. There’s no script because I don’t want to write anything before anything starts," said Emmerich, although he did confirm the following, "One day it will happen."