The Republican embrace of QAnon goes far beyond Trump.

Late last month, as the Texas Republican Party was shifting into campaign mode, it unveiled a new slogan, lifting a rallying cry straight from a once-unthinkable source: the internet-driven conspiracy theory known as QAnon.

The new catchphrase, “We Are the Storm,” is an unsubtle cue to a group that the F.B.I. has labeled a potential domestic terrorist threat. It is instantly recognizable among QAnon adherents, signaling what they claim is a coming conflagration between President Trump and what they allege, falsely, is a cabal of Satan-worshiping pedophile Democrats.

The slogan can be found all over social media posts by QAnon followers, and now, too, in emails from the Texas Republican Party and on the T-shirts, hats and sweatshirts that it sells. It has even worked its way into the party’s text message system — a recent email from the party urged readers to “Text STORM2020” for updates.

The Texas Republicans are an unusually visible example of the Republican Party’s dalliance with QAnon, but they are hardly unique. A small but growing number of Republicans are donning the QAnon mantle, potentially transforming the wild conspiracy theory into an offline political movement.