[7] He was elected to the Sejm on 25 September 2005, getting 3764 votes in 8 – Zielona Góra as a candidate from the League of Polish Families list.

On 13 June 2008, he resigned his membership of the League of Polish Families and backed out from political life.

[12] In the election he finished in fourth place receiving 6.8% and over 1.3 million votes.

It was indicated in the motion that Bosak enabled Grzegorz Braun to deliver an anti-Semitic speech in which, among other things, he referred to the ceremony of lighting Hanukkah candles as "racist.

"[15][16] Bosak is a hard eurosceptic who is pursuing a Polish withdrawal from the EU.

In his view, the major right-wing parties of Western Europe have capitulated to the liberal revolution and no longer promote conservative values.

[18] Bosak is married to Karina, a politician and legal counsel working for a right-wing populist, conservative Catholic law organization Ordo Iuris.