Résumé : The American movement known as Black Lives Matter, was launched in 2013, and increased public awareness about how undervalued black lives remain in the United States of America. It started in response to multiple instances of police brutality and has recently gained more ground. In reality, a black man by the name of George Floyd was shot and killed by a police officer on May 25, 2020, in Minneapolis, Minnesota. The pressure this movement has put on the policy system caused it to become a major topic in political discussions, has sparked controversy and has taken on a political tone. The movement is not just being discussed more and more on the internet and in the streets; politicians have started to tackle it. The results of the literature review have shown how crucial political discourse is. Political discourse is unavoidably significant in the interaction between the political actors, but it is also fiercely contested for its possible outcomes, such as its capacity to spread beliefs and to mobilize an audience (Hook, 2001).This thesis investigates the political discourse of Joe Biden and Donald Trump during their 2020 presidential debates in the United States of America. More particularly, it brings up the following research question: How did Joe Biden and Donald Trump promote the Black Lives Matter movement during the 2020 presidential debates of the United States of America? Both parties' candidates and vice-candidates are accused of mobilizing the Black Lives Matter movement in two different ways: on the one hand, the movement has supposedly been defended, while on the other hand, it has allegedly been attacked.The analysis on how Joe Biden and Donald Trump mobilized the Black Lives Matter movement during their 2020 presidential debates has successfully found a result. Indeed, the premise that the Black Lives Matter movement has been mobilized by both parties and their candidates and vice-candidates in two separate methods is effectively confirmed by this investigation. According to this data, the Democratic Party's Joe Biden and Kamala Harris have actually backed the Black Lives Matter movement more, while the Republican Party's Donald Trump and Mike Pence have opposed or denounced it more frequently.