In emails to Breitbart News leaked to Hatewatch, Miller said DACA recipients would contribute to altering the country’s demographics by replacing Americans born in the United States. White nationalists often promote the idea of the “great replacement” in their propaganda. Manifestos linked to terror suspects have cited this idea to justify acts of violence.

Anti-immigrant groups created by the late John Tanton also have advanced the theory of demographic replacement, including the Center for Immigration Studies and the Federation for American Immigration Reform.

Miller discussed the subject of DACA as it relates to demographic replacement in a March 10, 2015, email while criticizing former Florida Gov. Jeb Bush, then widely expected to be a top GOP candidate for president in 2016. Miller condemned his fellow Republicans on the subject of immigration and also birthright citizenship, which the 14th Amendment grants to those born or naturalized in the United States. Far-right extremists want to eliminate birthright citizenship outright.

“Demanding DREAMers be given citizenship because they ‘know no other home.’ That principle is an endorsement of perpetual birthright citizenship for the foreign-born,” Miller wrote in the email, using a term to describe DACA recipients. “Not only will the U.S.-born children of future illegal immigrants and guest workers be made automatic U.S. citizens, but their foreign-born children will too because, as [former Republican House Majority Leader Eric] Cantor said, ‘Our country was founded on the principle.’”

Miller added in the same thread: “Jeb [Bush] has mastered the art of using immigration rhetoric to sound ‘moderate’ while pushing the most extremist policies.” In a follow-up email, Miller referred to Bush’s desire to use “immigration to replace existing demographics.”

Miller similarly brought up DACA again in a June 29, 2015, email:

“[President Barack Obama’s] DACA amnesty remains in effect, which provides illegal youth (one of the single strongest pull factors for entering and remaining illegally) with both work permits and generous free cash tax credits,” Miller wrote to Katie McHugh, then a Breitbart editor, with the subject line “The Immigration Surge,” warning of the growing “foreign-born share” of America’s workforce.

McHugh leaked more than 900 emails to Hatewatch that Miller sent to her from March 2015 to June 2016 to help expose what she described as the “evil” underpinnings of President Donald Trump’s immigration policies. These include rescinding DACA and separating children as young as 4 months old from their parents at the border. McHugh said she was fired from Breitbart for publishing anti-Muslim tweets. While working for Breitbart, she was enmeshed in America’s far-right, anti-immigrant movement, but she has since renounced those views.

Miller was an aide to then-U.S. Sen. Jeff Sessions when most of the emails were sent. Miller has not responded to multiple requests for comment, and the White House called the Southern Poverty Law Center a “long-debunked far- left smear organization” after the series on his emails began to run. Breitbart News dismissed Hatewatch’s reports on the emails by saying that “it is not exactly a newsflash that political staffers pitch stories to journalists.”

Hatewatch previously reported that Miller showed an apparent interest in writers such as Jared Taylor and Jason Richwine, who have argued that Latinos are predisposed to lower IQs than whites, and that he treated nonwhite immigration with contempt throughout his correspondences with McHugh and Breitbart.

In a November 2015 email that Hatewatch has not previously published, Miller forwarded an interview with Phyllis Schlafly from far-right conspiracy website WorldNetDaily that argued undocumented immigrants should be shipped out on trains to “scare out the people who want to undo our country.”

In a July 2015 email, Miller sent an article to McHugh highlighting Fox News founder Rupert Murdoch’s criticism of Trump’s anti-immigrant rhetoric with the subject line “don't believe your lying eyes.”

Miller quoted from Murdoch’s Twitter account as stating, “Mexican immigrants, as with all immigrants, have much lower crime rate than native born.”

“Actually, no,” Miller responded in an email to McHugh. He included an article by Richwine arguing it was time to “lift the taboo” on talking about his belief that Latino immigrants are less likely than whites to be upwardly mobile.