Sitting on the Foreign Affairs Committee, after officially calling on the government in a written question, he is against the sale of French weapons used by Saudi Arabia and the United Arab Emirates to bomb the civilian population of Yemen on a daily basis.

[4] In an interview given on the program "Quotidien" of 23 February 2018 presented by Yann Barthès he clearly asks to suspend arms sales to Arab states of the Persian Gulf that use it on civilian populations, in line with a resolution of the European Parliament.

On 6 April 2018 he filed a request for the opening of a commission of inquiry to the National Assembly on the respect of France's international commitments with regard to arms export licenses in Yemen.

[5] He is also very involved on the issue of human rights in Cameroon, stressing the risks of an eruption of violence in the English-speaking area which is reminiscent of the process that led to the genocide in Rwanda.

His thesis and his recent work make it possible to approach sport in its anthropological continuum, from ancient Greece and its Olympic Games, to the present day.

In contrast to the work of Norbert Elias, who links the birth of sport to a lowering of the degree of violence in practice and to the advent of a specific ethic, his theory is not contrary to certain ideas of Pierre de Coubertin who wrote about the medieval knight that "The sporting passion takes hold of him, lifts him up and, through him and through him, will spread throughout all of Western Europe from Germany, Spain, from Italy to England, France serving as a central hub for movement " Inspired by the ideas of Georges Duby and Eric Hobsbawm, his work also focuses on the relationship between men and their territories and on the notion of human networks through the example of the orders of chivalry or the heralds of arms: the construction of a sporting code of conduct predates the eighteenth century.

Part of the thesis attempts to demonstrate that medieval sports events are first-class communication media, prefiguration of the modern Olympic Games.

Specialist games, Sébastien Nadot is more interested in the sporting phenomenon, the notion of conflict (physical or verbal) and also the "revival" of the Middle Ages in the twenty-first century.

The belief in the birth of sport ex-nihilo in England at this time would be a confusion with a process of increased democratization, especially in its gradual opening to women.

To block François Fillon and Marine Le Pen, he made a call to the gathering of "progressive forces" for the presidential election addressed to Emmanuel Macron, Jean-Luc Mélenchon, Charlotte Marchandise and Yannick Jadot.

In February 2017, faced with the difficulty of collecting the 500 sponsorships needed to run for the presidential election, he announced his withdrawal, to support Emmanuel Macron personally and joined the political council of En marche!

On 5 May 2021 he became president of the newly created parliamentary inquiry commission on migrations, population displacements and the conditions of life and access to law for migrants, refugees and stateless regarding France's national, European and international commitments.