President Trump on Wednesday tweeted congratulations to Marjorie Taylor Greene, a vocal QAnon conspiracy theorist who won the Republican nomination in Georgia's deep-red 14th Congressional District runoff.

Why it matters: The president's approval illustrates how the once-fringe conspiracy theory has gained ground within the GOP. Greene is among the at least 11 GOP candidates for Congress who have openly supported or defended the QAnon movement or some of its tenets, per Axios' Jacob Knutson.

What he's saying: "Congratulations to future Republican Star Marjorie Taylor Greene on a big Congressional primary win in Georgia against a very tough and smart opponent. Marjorie is strong on everything and never gives up - a real WINNER!" Trump tweeted.

How it works:QAnon is a far-right conspiracy theory that purports without proof that posts by an anonymous internet user from within the federal government are alluding to a secret war that the "deep state" is waging against President Trump.

• Its growing influence is sowing fear and confusion around some of today's most important issues, such as election integrity and the coronavirus pandemic, write Axios' Stef Kight and Sara Fischer.
• The FBI identified QAnon and other fringe conspiracy theories as domestic terrorist threats in 2019, according to Yahoo News.