The aim of the present study is to define a linguistic framework through exploring linguistic co-selection, and lexical cohesion in Donald Trump's speeches and tweets during COVID-19 pandemic. Another aim is to identify his ideological structure and implications concerning this world crisis. Corpus analysis, in addition to quantitative and qualitative data analyses were used. Two corpora were analyzed in this study. The first constituted five of Trump's speeches delivered during the period from the 11^th of March, 2020 to the 23^rd  of April, 2020, the peak of the pandemic. The second corpus was the tweets corpus. This included Trump's tweets transcripts related to COVID-19 pandemic, since the 22^nd of January, 2020 to the 3^rd of January, 2022. The selected corpora were analyzed using AntConc. 4.2.2 Tools, an online free software used for corpus analysis. The results showed that the most dominant type of cohesive devices used was repetition: in most of his speeches or tweets Trump resorted to the repetition strategy. The use of  lexical devices (including synonyms, hyponyms, collocations, antonyms and metonymies)  in Trump's speeches can have a rhetorical value that makes them  function as a means of social interaction with the aim of influencing the nation.