[5] Since 2016, Krajniak has been a member of the National Council of the Slovak Republic and vice-chairman of the We Are Family.

He was also a member of the Defense and Security Committee and the Permanent Delegation of the Slovak Republic to the NATO Parliamentary Assembly.

[6] During a press conference on 31 May 2018, together with chairman of We Are Family Boris Kollár, Krajniak announced his president candidacy for the 2019 Slovak presidential election.

[8] As Minister of Labour, Social Affairs and Family, Krajniak took up his position a few weeks after the 2020 Slovak parliamentary election during the COVID-19 pandemic.

[11] Zuzana Čaputová accepted Krajniak's resignation two days later and temporarily entrusted the function to Transport Minister Andrej Doležal.