New United Nations Secretary-General Antonio Guterres spoke with US President-elect Donald Trump on Wednesday, and the two had "a very positive discussion on US/UN relations," said a UN spokesman, a week after Trump slammed the world body on Twitter.

Guterres, a former Portuguese prime minister and UN refugee chief who began his five-year term on Sunday, spoke by phone with Trump, who will take office on Jan. 20, said UN spokesman Farhan Haq. Trump took to Twitter to disparage the 193-member world body after the United States abstained in a Dec. 23 UN Security Council vote, allowing the adoption of a resolution demanding an end to settlement building by US ally Israel.