"Sanctions are coming", the text stated with a date of November 5.
Unsurprisingly the internet jumped on the cinematic warning like a army of wights ripping apart human flesh.
In a separate statement, HBO said it "would prefer our trademark not be misappropriated for political purposes".
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The network further took to Twitter - Trump's favorite communication channel - and asked how to say "trademark misuse" in Dothraki, one of the show's fictional languages.
The photo was widely viewed as a direct response to the USA president's own Westeros-inspired tweet that read, "Sanctions are coming November 5".
It was very similar to the "Game of Thrones" line "WINTER IS COMING" - and used the same kind of typeface, including the vertical lines in the letter "O". Sophie Turner, who plays Sansa Stark on Game of Thrones, commented with a simple "Ew".
Cast member Maisie Williams also weighed in on Trump's reference to the series on which she stars, but kept her point brief. They are the second batch the administration has re-imposed since Mr Trump withdrew from the landmark accord in May. And HBO made that clear in a tweet. According to HBO president of programming Casey Bloys, the Thrones prequel may feel different, but it's still very much Game of Thrones. Elton John, whose music Trump has played consistently at his rallies, told The Guardian in 2016 that he didn't want his music involved in US politics.