Presidential advisor Stephen Miller fed anti-immigrant story ideas and white nationalist literature to a Breitbart reporter during his time as an aid to then Alabama Senator Jeff Sessions, according to a new report by the Southern Poverty Law Center.

The Alabama-based SPLC, a non-profit group that tracks white supremacist groups, reviewed upwards of 900 emails from Miller to Breitbart editor Katie McHugh. McHugh, who reportedly leaked the messages, was fired in 2017 for posting anti-Muslim tweets. McHugh told SPLC that Breitbart editors introduced her to Miller as someone who would guide her reporting.

The messages, which were shared online by the SPLC today, were sent in the lead-up to the presidential election, between March of 2014 and June of 2016, during the period Miller worked as an aid to Sessions. Miller sent messages from his work and personal email accounts focused on race and restricting non-white immigration, according to the group.

Miller in the emails referred to "diversity" as a national religion, forwarded articles form a white nationalist site and urged Breitbart to report on restrictive immigration laws of 1924.

Following Dylann Roof’s killing of nine churchgoers in Charleston, South Carolina in 2015, Miller lamented attacks on symbols Confederate heritage.

When Amazon pulled sales of Confederate flag merchandise following the shooting, Miller pushed McHugh to report on Amazon’s sale of “commie flags.”

She responded: “Yes, definitely. There’s all kinds of hammer and sickle merchandise, Che shirts, Stalin shirts… the list goes on and on.”

Miller replied: “Reveals just the stunning corporate hypocrisy that defines our modern culture."

The White House’s Stephanie Grisham responded in a statement to the SPLC report: “We have not seen the report. The SPLC, however, is an utterly-discredited, long-debunked far-left smear organization that has recently been forced – to its great humiliation – to issue a major retraction for other wholly-fabricated accusations. They libel, slander, and defame conservatives for a living. They are beneath public discussion.”

Sessions’ Senate re-election campaign did not immediately respond to requests for comments about the report.

In response questions from SPLC about Miller’s communications, Breitbart said in a statement,

“It is not exactly a newsflash that political staffers pitch stories to journalists – sometimes those pitches are successful, sometimes not.”

SPLC reporter Michael Edison Hayden called Miller’s influence on Breitbart during this period significant.

“He is in there depicting non-white people as criminals. He is depicting immigrants as being a danger to the United States,” said Hayden, later adding of Miller's relationship to Breitbart, “He almost seems like an uncredited editor."

As a Senior Advisor to President Trump since 2016, Miller is credited with shaping the administration’s immigration policies such as the travel ban against Muslims, and restrictions against refugees from entering the country. Miller worked in the office of then Senator Jeff Sessions as a press secretary. In 2012 he became Communication Director for Sessions’ office.

In the on-going communication with Breitbart in the lead-up to the election, Miller promoted coverage of the Immigration Act of 1924, a eugenics-based law that created quotas to prevent racial intermixing.

In a message following the 2015 arrest of the 14-year-old Muslim boy Ahmed Mohamed after he brought a rebuilt digital clock to school, Miller mocks what he calls America’s religion of diversity.

“Like the mystics of old, the one sure way to get rich in modern America is to offer yourself up as virtue signal to those seeking to prove themselves members in good standing of the national religion – diversity.”

According to the SPLC, Miller sent McHugh messages from the white nationalist website VDARE, a group they say is focused on “white genocide,” and in 2015, encouraged her to write about a French novel, “The Camp of the Saints,” popular among white nationalists.

In another message, Miller encouraged her to write a story about “poor and nonwhite students” contributing to dropping SAT scores.

Following Central America’s Hurricane Patricia in 2015, Miller told McHugh the “big story” was the disaster would cause mass migration through Temporary Protected Status, a pathway for immigrants fleeing natural disaster to gain temporary residency in the U.S.

This September, the Trump Administration declined to offer TPS for refugees from the Bahamas fleeing Hurricane Dorian.

According to Hayden, the SPLC investigation is an introduction to Miller’s communication with Breitbart and forthcoming reports will focus further on the extent of Miller’s influence on the publication.

“What Stephen Miller sent to me in those emails has become policy at the Trump administration,” McHugh reportedly told SPLC.