During a visit by Japanese Prime Minister Shinzo Abe, US President Donald Trump reportedly told a friend he was obsessed with the translator's breasts.
The claims are made in the latest issue of current affairs magazine Vanity Fair.
Editor Graydon Carter says Mr Trump didn't use those exact words, expressing his views in "his own fragrant fashion".
Mr Trump and Mr Abe spent time at the President's Mar-a-Lago club in Florida in early February, where the remarks are alleged to have been made.
There was only one woman working with the President and Japanese delegation at the time. Her identity is not known.
Mr Trump and Mr Carter have long traded insults. In December Vanity Fair published a review of his restaurant Trump Grill, suggesting it "could be the worst restaurant in America". Mr Trump blasted Mr Carter on Twitter, saying he had "no talent".
Mr Carter goes on to write that "Trump may be a joke, but the chaos and destructive forces around him are not. If he can cause this much havoc during his first few months in office, imagine what the country and the world will look like at the end of four years."