Jankov received the eighth position on DJB's electoral list for the 2016 Serbian parliamentary election and was elected when the list won sixteen mandates.[4] He was a member of the parliamentary committee on education, science, technological development, and the information society; a deputy member of the committee on the diaspora and Serbs in the region; and a member of the parliamentary friendship group with Brazil.[5]
Jankov opposed the selection of Muamer Zukorlić as chair of the education committee in 2016, noting Zukorlić's prior status as a mufti. He said that he opposed bringing science under the authority of religion, irrespective of the religious community in question.[6]
He left DJB in early November 2018. Although Jankov initially planned to join a new parliamentary group with other former DJB members, he instead resigned from the assembly on 13 November 2018.[7][8][9]