The Florida senator is presumably entering the presidential race shortly.

Game of Thrones may seem like an ominous backdrop for a would-be presidential candidate to tease a big reveal. But that's the tack chosen by a potential Republican contender.

While Hillary Clinton opted for an email, video clip and tweet (as well as a new logo), Marco Rubio is teasing an announcement with a reference to a wildly popular HBO show that will have its season premiere on Sunday. And it's not Veep:

Brace yourself... #gameofthronesseason5 #newamericancentury pic.twitter.com/2nGMSlFOhD

— Marco Rubio (@marcorubio) April 13, 2015

The "Big News Is Coming" tagline, of course, is a play on the "Winter Is Coming" refrain that's oft repeated on the show — but that usually signals that doom is on the way for characters.

Earlier Sunday, Clinton made the widely expected announcement of her candidacy, pledging in a tweet that "Everyday Americans need a champion, and I want to be that champion."

Rubio's HBO-themed tweet is only the latest tease for a "big announcement" on Monday, when the Florida senator is presumed to be throwing his own hat into the presidential campaign.

HBO did not immediately respond to a request for comment on the graphic.