Ms. Delphine O joined En Marche! from the creation of the movement. A member of the group of experts on international affairs who drew up the foreign policy program of Emmanuel Macron.

A member of the National Assembly as of the 22nd of July following the appointment of Mahjoubi to the second Philippe government the previous month. In the National Assembly, she sits on the Foreign Affairs Committee. She is a reporter of the Working Group on the opening of the National Assembly to society and its scientific and cultural influence the mission of information on the universal national service and Vice-President of the International Study Group on the Issues of the Democratic People's Republic of Korea (North Korea).

She is a President of France-Iran Friendship Group and Vice-President of France-Turkey Friendship Group.

Ms. Delphine O is a graduate of the Harvard Kennedy School's Master in Public Policy, she became an expert in geopolitics in the Middle East.