Donald Trump’s “deeply unsettling and disturbing” views make him a danger internationally, the UN’s human rights chief has said.
UN High Commissioner for Human Rights Zeid Raad al-Hussein cited Mr Trump’s comments on the use of torture and his attitude to “vulnerable communities”.
The Republican presidential candidate’s campaign has been marked by a number of controversial comments.
Recent crude remarks about women have caused the biggest political fallout.
Overnight President Barack Obama, at a rally for Democratic candidate Hillary Clinton, condemned those comments, saying: “The guy says stuff that nobody would find tolerable if they were applying for a job at 7-Eleven.”
During the campaign, Mr Trump has said that “torture works” and has promised to bring back “a lot worse than waterboarding”.
Waterboarding and other harsh interrogation techniques previously used by US forces on terror suspects have been banned by the Obama administration.
Mr Trump said of waterboarding in June: “I like it a lot. I don’t think it’s tough enough.”
His comments on migrants, Mexicans in particular, have drawn fire from rights activists.