QAnon followers view President Donald Trump as a hero fighting against a cabal of child-sex predators including prominent Democrats.
In their resolution, Republican Representative Denver Riggleman and Democratic Representative Tom Malinowski described QAnon as one of the "fringe political conspiracy theories."
They also called on the FBI and other federal law enforcement agencies to make efforts to tackle "violence, threats, harassment, and other criminal activity" by conspiracy theory adherents.
The FBI last year included QAnon in a warning about "conspiracy-theory-driven domestic extremists."
First lady Melania Trump is apparently against the movement, as suggested by East Wing chief of staff Stephanie Grisham.
"I haven’t talked to her about that specifically, but I think there’s constantly this misperception that it’s about online bullying, which of course gets tied to the president," Grisham said on MSNBC. "It’s about online safety, and it’s about teaching children that there are predators out there online and that they need to really watch out who they’re talking to online and what they’re doing."
While Facebook has removed nearly 800 QAnon conspiracy groups, the president himself has been mostly reticent, or claiming to be unaware of the conspiracy theory.