Linguistic Signs, constitutive units of political speeches, are discursive mechanisms used by political leaders to draw people’s attention. President Trump does not make the exception in his three speeches (2018) since he resorted to a plethora of signs, as a discursive strategy to reinforce his ideological argumentation. The interest of the study lies in the decoding of the persuasive process around the signs that are likely to entice the adhesion of the American citizens to Trump’s ideologies. It intends to describe and explain how the use of signs, full of meanings effects, contributes to transform people; being, first, mere listeners to adherents, subsequently. In doing so, Systemic Functional Linguistics of Michael Halliday, theoretical framework of the investigation, considers language as a semiotic system that explains it through interpersonal, textual and ideational metafunctions. The investigation reveals that the persuasive arsenals mostly lie in the phatic and expressive functions of signs, use of colors, and strategy of closeness carried out by vocative and slogans. Keywords: Discourse, ideologies, metafonctions, proximity, signs