19 December 2016, 21:27 GMT
WASHINGTON (Sputnik) — Earlier in the day, Karlov was killed by a gunman at an art gallery exhibition opening in Ankara. Three other people were also injured in the attack.
"The murder of an ambassador is a violation of all rules of civilized order and must be universally condemned," Trump said in a statement on Monday.
Trump added that the attack was carried out by "a radical Islamic terrorist."
The US president-elect also commented on the recent attacks in Germany and Switzerland on his Twitter page, claiming that the incidents should change the world's thinking.
Today there were terror attacks in Turkey, Switzerland and Germany — and it is only getting worse. The civilized world must change thinking!
— Donald J. Trump (@realDonaldTrump) 19 декабря 2016 г.
