Bulgaria - 1991 Constitution

Title Article 99
Chapter 4 - President of the Republic
Article

99

(1) Following consultations with the parliamentary groups, the President shall appoint the Prime Minister-designate nominated by the party holding the highest number of seats at the National Assembly to form a government.

Categories - Parliamentary party (Composition national legislature (parliament/ senate))
- Parliamentary party (Government formation)
Source Bulgarian parliament website (www.parliament.bg)