He was a Member of the Sejm of Poland in X, I, II, III, IV I V convocations, co-founder of the Conservative People's Party and its president in 2000–2002.

He was appointed the president of a special parliamentary commission for the investigation of the Security Service (Służba Bezpieczeństwa).

In 1995, he was the co-founder of the "3/4 initiative" – a movement created in order to prevent Aleksander Kwaśniewski from winning the presidential elections and refused to support his party's candidate Jacek Kuroń.

He was elected to the Sejm for the fourth time from Solidarity Electoral Action coalition list, becoming chairman of the parliamentary Interior Affairs Committee.

When the Civic Platform was formed in January 2000, Rokita was reluctant to ally SKL with it, but a steady trickle of members to the new center right party forced him to.

His participation in the committee has given him a tough inquisitor image and made him very popular, effectively resurrecting him as an active politician.

Officially, he claimed it was because of his wife Nelly's decision to enter Polish politics as an advisor to President Lech Kaczyński (affiliated with the right-wing Law and Justice Party).