Climate change emerged as a high-level global issue in the Rio Earth Summit (1992). In the United States, the Clinton Administration was the first to associate climate and security in official documents. Since then, there has been an overall tendency to consolidate climate security in political discourses in the United States. Based on the Copenhagen School criteria, analysis of speeches by Post-Cold War U.S. governments (Bill Clinton, George W. Bush, Barack Obama, Donald Trump, and Joe Biden), and a review of each Administration’s climate change policies demonstrate how climate securitization has evolved in the United States. Climate securitization has evolved as a nonlinear process characterized by periods of progress and reversals of narratives and securitizing measures with a strong influence of partisanship.