This paper analyzes and assesses the translation of using presupposition. Besides, the paper sheds light on the way some Western analysts on the Washington Institute website portray Islamists' political ideologies during ex-president Muhammad Morsi's reign of Egypt via using presupposition. These analysts' articles are collected from the site of The Washington Institute for Near East Policy (www.washingtoninstitute.org). Further, and most important, the present paper assesses how Western politicians' representations of Islamists' ideologies are translated and transmitted from the English source texts (STs) into their equivalent Arabic target texts (TTs). This is carried out on the basis of intertextuality, i.e. how rendering such representations and ideologies from the ST into the TT highlights the intertextual relation between both texts. In addition, this study attempts to distinguish between Islam as a religion and Islamism or Political Islam as a political movement via underlining the salient facets of Islamists' political ideologies as represented by Western analysts during Morsi's reign