Terho participated in the 2015 parliamentary elections and was elected to the parliament with 10,067 personal votes.[5] His term in the European Parliament ended on 27 April, when Terho officially accepted the seat in the Finnish Parliament.[6] He subsequently became the chairman of the Finns Party's parliamentary group.[7] On 5 May 2017, he started as the Minister for European Affairs, Culture and Sports in Sipilä Cabinet.[8]
In 2017, Terho ran against Jussi Halla-aho for party chairmanship, but ultimately lost the chairmanship election at the party convention on 10 June. On 13 June, Terho and 19 others left the Finns Party parliamentary group to found the New Alternative parliamentary group which was turned into a new party known as Blue Reform.[9] After the split, the New Alternative group took the Finns Party's place in the cabinet and Terho continued as a Minister.
In 2019 parliamentary elections, Terho was a candidate of the Blue Reform in Uusimaa constituency, but was not elected.[10] After leaving politics, Terho became a writer and published his first book Olev Roosin kyyneleet in January 2021.[11]
Terho wrote a chamber music piece, of around five minutes long, to celebrate Finland's 100 years of independence, for the Kuopio city orchestra. The piece is arranged by Terho with conductor Heikki Elo, who together have orchestrated the piece.[12][13][14]
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