Slovenia's prime minister has formally resigned, calling for an early vote to be held in the small EU nation next month, AP reported. Alenka Bratusek handed in her resignation to the parliament speaker Monday after announcing earlier she was stepping down. Slovenian lawmakers must also formally acknowledge the resignation. The 44-year-old financial expert, who steered the country through euro-zone economic turmoil, withdrew after losing the leadership of her Positive Slovenia party to Mayor Zoran Jankovic of Ljubljana, the capital.