Harper calls the claim "misinformation," although he has not outright denied plans were in the works to combine the two departments.
Green party Leader Elizabeth May says credible sources within the government have told her party of the merger plans.
May raised the issue during question period in the House of Commons.
Harper replied with a belittling response, suggesting May's sources should talk with him so he could set the record straight.
Outside the Commons, May refused to divulge her sources over concerns that they could face repercussions for speaking out.
Also on HuffPost