He was one of the founders and leader of Movement of Free Citizens, a centre-left political organization in Serbia before leaving it in January 2019.

[1] In a scenario of extraordinary circumstances, Janković lost citizenship in the newly-formed Federal Republic of Yugoslavia when war broke out in Yugoslav territories due to his father having been born in Bosnia and Herzegovina.

[1] The new Yugoslav government listed Janković as a refugee when the Republic of Bosnia and Herzegovina formally declared independence from Yugoslavia.

During a hearing in the National Assembly,[7] Janković claimed that Military Security Agency broke the law during the incident.

He was then attacked by the MPs of the governing Serbian Progressive Party (SNS) and the Minister of Defence Bratislav Gašić.

[10] After that, several MPs of the SNS heavily criticized the Ombudsman and called for Janković to resign claiming his actions were politically motivated.

[17] Janković clashed with the Government again in April 2015 when he claimed that Bratislav Gašić was responsible for a military helicopter crash in which 7 people have died.

[22] In late 2016, media outlets started speculating that Janković might be a suitable candidate of the opposition at the 2017 Serbian presidential election.

[23] In November 2016, one hundred prominent public figures signed a petition to Janković calling him to run for President in 2017.

[26] In 2017, Amnesty International reported pro-government media in Serbia continued to smear independent journalists and human rights defenders, as well as the Ombudsperson's Office.

[29] In December 2016, Janković formally announced that he would run as an independent for president of Serbia in the 2017 presidential election.