Re-elected deputy in February 2013 on the PDL list, he became vice president of the Council for the Authorizations to proceed of the Chamber and a member of the Justice Commission.

On 18 November 2013, with the return of the People of Freedom to the name Forza Italia, he joined the New Centre-Right led by Angelino Alfano, being elected Group chairman in the Chamber of Deputies and Regional Coordinator of the party in Piedmont.

On 28 February 2014 he became Deputy Minister of Justice in the Renzi government, thus leaving the position of group leader and being replaced by Nunzia De Girolamo.

[2] On the same day he decided to leave Popular Alternative but Silvio Berlusconi locked the doors of Forza Italia to Costa and other refugees, suggesting that they give life to a new centrist formation.

On 19 December he joined Us with Italy, the so-called "fourth leg" of the center-right coalition, and in the parliamentary elections of 2018 he was re-elected as a deputy in the uninominal constituency of Alba, obtaining 48.24% of the votes.