This chapter focuses on the role of Canada's intelligence agencies to defend against foreign interference in the 2019 Federal Election. It highlights the role of the Canadian Security Intelligence Service (CSIS or “the Service”), the Communications Security Establishment (CSE), and to a lesser extent the new Rapid Response Mechanism (RRM) housed at Global Affairs Canada (GAC) to identify and counter the threat of foreign cyber influence under their statutory mandates and as part of the newly formed Security and Intelligence Threats to Elections (SITE) Task Force. This chapter relies on open source information and documents obtained via access to information requests to detail the principal legal authorities through which Canadian intelligence agencies sought to defend campaigns and voters from foreign cyber influence, as well as critical election infrastructure from direct attacks. In doing so, this chapter raises questions about the appropriate role of intelligence officials and the Ministers responsible for their agencies when it comes to safeguarding Canadian elections. It also identifies how the Government of Canada sought to ensure that decisions made in the interest of national security were free from partisan interference, and suggests areas for improvement.