Lajcak, 54, was elected by acclamation as president of the 72nd session of the UN General Assembly at a special session here yesterday.
The 72nd session of the United Nations General Assembly, the 193-member powerful body, will commence from September 12.
Lajcak, who was one of the candidates last year for the position of UN Secretary General, will succeed Fijian diplomat Peter Thomson.
"Thank you @UN General Assembly 4 electing me the next @UN_PGA. Looking fwd to work w/all of you to make this world a better place to live in," Lajcak, Slovakia's Minister of Foreign and European Affairs, tweeted following his election.
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Lajcak called for greater trust between the UN and its Members, stressing that he would do "his utmost to support progress on the United Nations reform agenda, which is vital to improve the efficiency and role of the General Assembly, as well as reform the Security Council into a twenty-first- century body."
UN Secretary General Antonio Guterres congratulated Lajcak on his election, saying he has always demonstrated an "impressive command" of all aspects of UN action and a strong commitment to the principles that govern our work.
"I think that both of us saw high expectations and got a strong sense of how much governments and people need the United Nations to respond to the deserving cries of people around the world for lasting peace, justice, human rights and human dignity," Guterres said.
The UN chief thanked Thomson for his leadership over the past year, voicing appreciation for guiding the General Assembly "outstandingly well" during the transition from Secretary-General Ban Ki-moon to Guterres taking charge at the helm of the UN.
In May last year, the Slovak government had formally nominated Lajcak as a candidate for the position of UN secretary-general.
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