Pellegrini was sworn in as Prime Minister after his predecessor, Robert Fico resigned on 15 March 2018 in the wake of the murder of journalist Ján Kuciak.
Pellegrini dilantik sebagai Perdana Menteri setelah pendahulunya, Robert Fico mengundurkan diri pada 15 Maret 2018 setelah terjadinya pembunuhan jurnalis Ján Kuciak.