Of all the apparatuses presidents have at their disposal for making pronouncements—press secretaries, official statements, televised addresses from the Oval Office—the one President Trump used to trumpet forthcoming sanctions on Iran is by far the strangest: a Game of Thrones meme.

On Friday morning the president posted the image below on Twitter. It’s a picture of himself emblazoned with the phrase “Sanctions Are Coming” in a typeface not that dissimilar from the one used in the Game of Thrones logo along with the date “November 5.” Subtle, it was not.

As soon as it went up, and as soon as it was clarified by the White House that the sanctions in question were indeed the ones that had been relaxed during the Obama administration and which Trump had been seeking to reimpose, Twitter went nuts. Folks began responding with memes of their own—"Indictments Are Coming” etc.—and even the show’s cast got involved. Sophie Turner, who plays Sansa Stark, replied “Ew,” and Maisie Williams (Arya Stark), in perhaps the best Twitter drag of the day, retweeted the president and just added “Not today.” (“Not today,” for those who don’t remember, is what Arya Stark’s swordfighting instructor, Syrio Forel, told her is what she should say to the god of death.)

Then HBO got in on the action, sending out a tweet reading, “How do you say trademark misuse in Dothraki?” Reached for comment the network added, “We were not aware of this messaging and would prefer our trademark not be misappropriated for political purposes.” Trump evoking the show’s logo and slogan, it seems, doesn’t sit very well with the people who actually make the show.

But could the network or creators successfully sue? Probably not. First off, it doesn’t seem likely that HBO actually wants to make a legal claim of trademark infringement. At most, the network is playing along. Trump referenced the show; they responded. Simple as that. But the response, and subsequent online chatter, did raise some questions about whether or not the president went too far.

Most likely, he didn’t.

If HBO were to bring a claim, it would probably be for what’s known as trademark dilution, says Daniel Nazer, a staff attorney for the Electronic Frontier Foundation’s intellectual property team. Typically, these are the kinds of claims companies make when they feel their very-famous trademarks are being used in ways that deplete the uniqueness, or dilute, their intended message. A company can’t, say, put something that looks like the Nike “swoosh” logo on the side of a commercial plane or use “Just do it.” to sell condoms.