At President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's rally in Tampa on Tuesday night, a conspiracy theorist who has slowly gained popularity under Trump's presidency leaped into prime time — anonymous conspiracy theorist "Q."

Some attendees wore shirts with Q logos, while others held up posters promoting the theory: TV cameras even caught one person holding a sign reading “We are Q” as Trump stood in the background.

A wide-ranging and vague theory, “QAnon” touches on a number of popular conspiracy theories: Democrats and prominent Hollywood figures are orchestrating underground pedophile rings; special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s probe is a front for investigating Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE and Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE for their ties to said rings; and hundreds of sealed indictments may have already been handed down in the Clinton case.

The theories are proliferating online, fanned by cryptic messages posted by a person or persons going by the initial “Q." The persona first posted on 4chan last year, claiming to be a high-ranking security official in the Trump administration.

Oh look, QAnon sign at the Trump rally pic.twitter.com/2BwYWMJtWS — Salvador Hernandez (@SalHernandez) July 31, 2018

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Among other things, Q alleges that Trump was persuaded to run for president by military leaders, and that together they are planning mass arrests of deep-state actors and perpetrators and will send them to be detained in Guantanamo Bay.

Those allegedly forthcoming arrests are called “The Storm,” referring to Trump’s cryptic comment warning of a “calm before a storm” during a meeting with military leaders last year.

The popularity of the "deep state" theory, which has been popularized by Trump on Twitter and regularly raised by his most high-profile supporters in TV appearances, may have helped Q's theories proliferate in the Trump era, according to one expert who studies the spread of online theories.

Q’s messages, called “crumbs” by his followers, are vague and use code names to refer to major players in the theory. His devotees who interpret the messages to fuel the theory are in turn called “bakers,” and often speculate about who Q could be, with some suspecting that Trump himself is behind the posts.

Those devoted followers have seized on current events to fuel their own theories: The Daily Beast reported that many believed that the Justice Department’s inspector general report released in June would reveal the official allegations against Clinton and others. They now reportedly believe the version that was released was altered by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, and that Trump possess the true version of the report.

However, the theory has begun to shift from solely existing online: Q’s followers held a parade in Washington, D.C., earlier this year, with some calling for him to reveal his identity. Billboards referencing the theory have sprouted up in different parts of the country. And the Q supporters at Trump’s Tuesday night rally marked the community’s most high-profile appearance yet.

QAnon billboards are a thing now. This one's in Georgia. pic.twitter.com/VQ0Hn3T7h6 — Will Sommer (@willsommer) June 29, 2018

Marko Kovic, a researcher who has studied conspiracy theories and is the founder of the ethics consulting firm ars cognitionis, told The Hill that while conspiracy theories are generally followed by people across the ideological spectrum, he believes QAnon has grown more popular among Trump supporters as a way to explain some of the administration’s shortcomings.

“If I am a strong supporter of Donald Trump and things maybe aren’t going as well as I would like them to go, it’s easy to spin it into a theory that tells me, ‘actually it’s going great, it’s going extremely well,’ ” he said.

Kovich added that while Trump has not directly promoted the QAnon theory himself, his attacks on Mueller’s probe have added “fuel to the fire.”

Joseph Vitriol, a college fellow at Harvard University who has also conducted research on individuals who believe in conspiracy theories, told The Hill it’s likely that the conspiracy theories will strengthen as Mueller’s probe and other investigations tied to the president move forward.

He said that while it is difficult to dissuade people from believing in conspiracy theories, Republican leaders have a responsibility to “speak clearly and certainly and regularly, about how these beliefs about the deep state are inaccurate, they’re false and are deeply disturbing and damaging to our civic and our political lives.”

“But it won’t happen because there’s an electoral advantage to keeping their base angry and upset, and unclear and uncertain on what these investigations and special counsel’s actions might imply for the president and their political agenda,” Vitriol added.

Some fear that QAnon, like the so-called Pizzagate theory — which alleged that Democrats like Clinton and her former campaign head John Podesta were running a pedophile ring linked to D.C. pizzeria Comet Ping Pong — could eventually lead to violence.

A man was arrested in 2016 after he walked into Comet Ping Pong and fired a weapon, telling police that he was investigating the unfounded claims that the restaurant was being used by Clinton and Podesta to facilitate a child sex-trafficking ring.

Vitriol said that conspiracy theorists often think their way of life or beliefs are being threatened, and will occasionally take action in response to those perceived threats.

“People might believe it’s their moral and ethical obligation as people to act on that concern,” he said, citing some theories that the president is being unfairly attacked or facing a coup from within the government. “And the more extreme those beliefs are, the more urgent that sense of need to act becomes. And the more consequential the mainstream legitimization of bizarre, conspiratorial beliefs [becomes].”