This paper is conducted within the framework of critical discourse analysis as it aims at investigating the lexical semantic primes that are represented in the last political debate between Hillary Clinton and Donald Trump. The universal primes belong to what is known as the 'Natural Semantic Meta-language' (NSM). The main aim of this theory is to reduce the semantics of all lexicons to a limited set of words/semantic primitives. This theory deals mainly with language, cognition, and culture. Therefore, the semantic primes used in the political debate display the linguistic strategies employed by the candidates. They play the role of describing, then interpreting the meaning transferred through the process of communication. Moreover, these semantic primes reflect a degree of intensity of information (in a simple way) either in speech or written text. The extent to which each candidate tries to impress, by focusing on linguistic devices, the listeners/readers of the debate, lexical density (the ratio between function to content words) is investigated to reflect the intensity of information represented in the debate