In 2013, the local organization of CDU in Hagen nominated Giousouf for the federal elections. In the next two preliminary inner-party elections, Giousouf was able to make her way for the federal election as direct candidate in the Ennepe-Ruhr-Kreis District in September 2013. Giousouf became the first ever Muslim politician of the CDU to be elected into the Bundestag.