Hellvig entered the Romanian Humanist Party (PUR), as the PC was then called, in 2003, and served as interim head of its Bihor County chapter from 2004 to 2005.[2] Elected to the Chamber in 2004, he served, from 2005 to 2008, on its defense committee. He crossed to the PNL in September 2008,[5] and served as its secretary general from 2011 to 2014. From January to November 2007, he was a Member of the European Parliament.[2][6] At the 2008 election, he ran for re-election to the Chamber, but was defeated. Subsequently, he became a close ally of PNL leader Crin Antonescu.[7]
In May 2012, Hellvig was named Regional Development and Tourism Minister in the new Ponta cabinet, serving until December. Elected to a new term in the Chamber at that point,[2] he initially sat on the foreign affairs committee, until February 2013, when he switched to the European affairs committee. He became one of the Chamber's vice presidents in December 2012.[8] In November 2012, investigators from the National Integrity Agency (ANI) charged that for several months, from the time he took ministerial office until he left Sintezis that September, he was, legally, in a conflict of interest. Hellvig denied the charges, which were upheld the following April by the Bucharest Court of Appeal, prompting him to state he would continue to fight for vindication.[9] In December 2014, the High Court of Cassation and Justice decided in Hellvig's favor, ruling that he had not been in a conflict of interest and rejecting the ANI's claims.[10]
In September 2013, when two vacancies opened in the PNL's delegation to the European Parliament, Hellvig filled one of the openings after resigning from the Chamber.[11] As MEP, he sits on the Internal Market Committee.[12] He won a full term as MEP at the May 2014 European Parliament election.[13] In February 2015, PresidentKlaus Iohannis nominated him to be director of the Romanian Intelligence Service;[14] the following month, a joint session of Parliament confirmed him to the post on a 498–15 vote.[15] A vice president of the PNL at the time, he subsequently resigned from the party, as required, and also from the European Parliament.[16][17] He resigned as SRI director in July 2023, citing a desire to avoid “petrification” in office.[18]