This paper displays a Systemic Functional Linguistic and Critical Discourse Analysis of Boris Johnson's first public speech on COVID-19. COVID-19 is a very dangerous infectious disease caused by the last discovered virus of the Coronavirus strain. This virus began in Wuhan's Chinese city in December 2019. COVID-19 has spread from Wuhan to the rest of the world. It has now turned into a pandemic affecting the whole world. Halliday's (2004) model of systemic functional linguistics (meta-functions), relying on interpersonal and ideational meta-functions, and Van Dijk's ideology and discourse (2000) model depending on the argumentation categories, are the adopted models of analysis. The paper's main objectives are to analyze the speech of Prime Minister Boris critically to uncover the used ideologies to advise, persuade and control the people's beliefs and actions. In addition, this paper aims to identify the interpersonal and ideational meta-functions in the selected speeches of the chosen figure stating their frequencies, then finding out how these features uncover the ideological strategies used to affect all people; Finding the argumentation categories that are used by the prime minister to support the ideas and actions presented. The paper presents a theoretical background of discourse, Critical discourse analysis, dominant, and ideology. Explains the adopted models; Analyzes the speech critically.