Lehman spoke with the film's director about the threat: "I think there's a pattern," Kenner said of Singer's letter in an interview. "It's to come after and try to silence critics and to intimidate. And when [Singer] implies litigation is very expensive, I think it's an attempt to be intimidating."<ref>Evan Lehman, ClimateWire, Environment and Energy Publishing, "'Merchants of Doubt' emails spark fiery debate about strategies of climate skeptics" (Mar. 9, 2015) [http://www.eenews.net/stories/1060014671].</ref>
The email chain has been provided by a source to the Center for Media and Democracy's SourceWatch and this document can be accessed and downloaded here: <http://www.sourcewatch.org/index.php/File:S_Fred_Singer_emails_about_attacking_Merchants_of_Doubt_March_2015.pdf
This email chain references climate change deniers and potential allies who were part of an email chain initiated by S. Fred Singer to help assail the documentary "Merchants of Doubt," including: