The FBI has found a new gateway to declare Christians as criminals, a federal whistleblower said on "Tucker Carlson Tonight." 

An internal document from the bureau’s Richmond, Virginia, field office allegedly vowed to spy on "radical traditionalist Catholics and their ideology."

"They have found a gateway in what they think is fringe Catholicism in order to move into Christians in general and declare them to be the actual criminals in this country or the potential terrorists," federal whistleblower and former FBI agent Kyle Seraphin said. 

Seraphin said the document is antithetical to Catholicism and was written by someone who believes abortion rights must be upheld and the LGBTQ agenda "has to be pushed down the American people’s throats." 

PRAYING THE ROSARY: UNDERSTANDING THE TRADITION THAT HELPS CATHOLICS MEDITATE ON JESUS AND MOTHER MARY 

VATICAN CITY, VATICAN - MARCH 13: A woman holds rosary beads while she prays and waits for smoke to emanate from the chimney on the roof of the Sistine Chapel which will indicate whether or not the College of Cardinals have elected a new Pope on March 13, 2013 in Vatican City, Vatican. Pope Benedict XVI's successor is being chosen by the College of Cardinals in Conclave in the Sistine Chapel. The 115 cardinal-electors, meeting in strict secrecy, will need to reach a two-thirds-plus-one vote majority to elect the 266th Pontiff. (Photo by Dan Kitwood/Getty Images)

Rosary beads help a person keep their place in the prayer. They consist of 10 beads in between larger beads. (Dan Kitwood/Getty Images)

"I'm friends with people who love the Latin Mass," the Catholic federal whistleblower told Fox News. "I grew up in a traditional school where I actually learned Latin in fifth and sixth grade and all the way through high school and it doesn't seem reasonable, but it is the state of the FBI at this point that they are so desperate to find White supremacists that they're going to look at the Catholic Church." 

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Seraphin said that the whistleblower who brought the information to him is not a Catholic, but knew it was problematic. 

"He or she stated the very simple statement, which is that if they're going to go after radical, traditional Catholics, then radical traditional Baptists are next and radical, traditional evangelicalism and anybody else that espouses essentially what is radical, which is just a Christian faith and that is dangerous apparently in this country," he said.