 Three years later, he participated to the right-wing party of Charles Millon, excluded from the UDF for the same reasons as Poniatowski, and they founded the "Droite libérale-chrétienne" (Liberal-Christian Right) which continued to ally itself with the National Front.Poniatowski finally retreated from political life in 1999, replaced as mayor of L'Isle-Adam by his son Axel Poniatowski.He then died three years later, on 15 January 2002.