Poniatowski was then senator of the Val-d'Oise from 1989 to 1995 and continued to advocate in favour of electoral agreements with the National Front by taking as model the (difficult) relationship between the Socialist Party (PS) and the Communist Party (PCF).
Poniatowski was a senator of Val-d'Oise from 1989 to 1995, and continued to advocate for electoral agreements with the National Front by drawing parallels to the complex relationship between the Socialist Party (PS) and the Communist Party (PCF).