First elected to the Parliament in 2015 representing NCP, his tenure in the party was cut short following his complaints about leadership in 2018.

"[4] In the Parliament, Harkimo sits in opposition, although he voted in favor of swearing in the Rinne Cabinet.

He later explained this by saying he wanted to give the government platform a chance, since he considered many of its goals positive.

Töölö football stadium was completed on 10 June 2000, just in time for the opening match between FC Jokerit and HJK.

In the 2012 presidential election, Harkimo supported the Coalition Party's Sauli Niinistö campaign with 10,000 euros through Hjallis Promotion Oy.

In October 2017, Harkimo started to publish YouTube videos, discussing politics, business, sports and other subjects.

In 2019 Harkimo bought the 49% share of Jokerit from Russians Gennady Timchenko and Roman Rotenberg, the owners of Arena Events Oy.

Harkimo then sold 100% of Jokerit to Jari Kurri, a long time manager of the club.

Harkimo's intent was to exclude the club from the US sanction list drawn upon the annexation of Crimea.