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Iran and P5+1 countries have successfully reached an agreement on nuclear development programs through the Joint Comprehensive Plan of Action (JCPOA) on 14 July 2015. The agreement gives hope that tensions between Iran and the Western countries, especially US, would end in line with the signing of the agreement. However, when the US administration was taken over by Donald Trump, the hope was dashed when Trump announced that US was withdrawing from the nuclear agreement on 8 May 2018. Trump considered that the JCPOA agreement to be the worst that involved US. Trump also claimed that Iran was a fanatical regime and made multiple violations of the agreement. The question in this study is whether Trump's personal character and leadership style can influence his foreign policy?. To answer this problem, secondary data has been collected and then analyzed using a qualitative descriptive approach. The data is collected through library resources such as books, journals, reports, and internet materials. Using the idiosyncratic approach, in particular personal aspects, characters, and leadership styles, this study concludes that Trump's character and leadership style is seen to have played an important role in every policy taken. Almost every policy taken by Trump is deemed populist and conservative that his controversy policy is known as Trumpism. Iran's nuclear future has become uncertain as Trump announced the US withdrawal from the Iran nuclear agreement. [ABSTRACT FROM AUTHOR]