But at UN lunch meeting, the did just that.
Known for his teetotalism, Trump became a talking point among the world’s media gathered in New York after he lead a toast to the ‘great, great potential’ of the United Nations.
He appeared to take a sip of wine before passing the glass to an aide standing nearby.
He was also later spotted raising a glass to UN Secretary General Antonio Gutteres with Japanese Prime Minister Shinzo Abe.
US media speculated as to what it was that he was drinking, with NPR politics editor Domenico Montanaro tweeting: “Is That wine or Diet Coke for Trump?”.
Others followed suit with Bloomberg White House correspondent Jennifer Jacobs cautiously calling it “maroon liquid.”
President Trump has repeatedly said he doesn’t drink after losing his older brother Fred to chronic alcoholism aged 41.
Mr Trump is reportedly known to break his no alcohol rule when taking communion at church.