A journalist by profession,[1] Rotondi was elected to the Regional Council of Campania in 1990 for Christian Democracy (DC).

In 2001, Rotondi was elected to the Chamber of Deputies for the House of Freedoms in the single-seat constituency of Rho, and he has since been elected either to the Chamber of Deputies or the Senate of the Republic for centre-right coalition political parties.

Hailing from the United Christian Democrats (CDU), Rotondi was originally affiliated to the White Flower alliance, which later evolved into the Union of Christian and Centre Democrats (UDC).

He then established a new party strongly inspired on Christian ideals and the defunct DC, namely Christian Democracy for Autonomies (DCA), which ran in a joint list with the New Italian Socialist Party (NPSI) in 2006.

Within the PdL and later the new Forza Italia, Rotondi established an associate party named Christian Revolution.