More than 100 Democratic lawmakers on Thursday signed on to a letter calling for President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE to fire senior adviser Stephen Miller Stephen MillerSpecial counsel investigating DeVos for potential Hatch Act violation: report Trump confirms another White House staffer tested positive for COVID-19 Biden pick creates furor, underscoring bitterness over Obama immigration policy MORE as a civil rights group details hundreds of controversial emails he sent prior to his time in the administration.

"Given Mr. Miller’s role in shaping immigration policy for your administration, his documented dedication to extremist, anti-immigrant ideology and conspiracy-mongering is disqualifying," the lawmakers wrote.

The Democrats wrote that Miller's ideology manifested itself in the form of several policy decisions, including a travel ban on citizens of several Muslim-majority countries, a decrease in refugee admissions and the decision to end Deferred Action for Childhood Arrivals (DACA).

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"These are just a few obvious examples of Mr. Miller’s white supremacist influence on your immigration policy, and it seems likely that his perfidious adherence to extremist ideology has shaped your administration in ways that are not yet public," the lawmakers wrote. "Miller’s emails and the sentiments expressed in them are incompatible with public service and render him unfit to shape any policy – immigration or otherwise."

Reps. Don Beyer (D-Va.), Barbara Lee Barbara Jean LeeEnding the Hyde Amendment is no longer on the backburner Overnight Defense: Nearly 500 former national security officials formally back Biden | 40 groups call on House panel to investigate Pentagon's use of coronavirus funds 40 groups call on House panel to investigate Pentagon's use of coronavirus funds MORE (D-Calif.), Ilhan Omar Ilhan OmarOmar urges Democrats to focus on nonvoters over 'disaffected Trump voters' Omar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE (D-Minn.) and Bill Pascrell William (Bill) James PascrellRep. Bill Pascrell named chair of House oversight panel Trump says people 'in the dark shadows' are controlling Biden Democrats tear into Trump's 'deep state' tweet: His 'lies and recklessness' have 'killed people' MORE (D-N.J.) are among those who led the effort to send the letter to the White House. Other Democrats signing on include Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Tim Ryan Timothy (Tim) RyanNow's the time to make 'Social Emotional Learning' a national priority Mourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' MORE (D-Ohio), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.) and Tom Malinowski Thomas (Tom) MalinowskiDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program The Hill's Morning Report - Presented by Facebook - First lady casts Trump as fighter for the 'forgotten' Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks MORE (D-N.J.).

Democrats and civil rights groups have hammered Miller over the past week as the Southern Poverty Law Center (SPLC) publishes summaries of emails the White House aide sent in 2015 and 2016 prior to working in the White House.

The emails, roughly two dozen of which have been reviewed by The Hill, contain links and references to publications associated with white nationalism and show how Miller coordinated with Breitbart News to shape coverage around immigration and the 2016 GOP primary.

One exchange from August 2015 shows Miller expressing concern to a then-editor at Breitbart that Mexicans affected by Hurricane Patricia could be granted temporary protected status (TPS).

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“That needs to be the weekend’s BIG story. TPS is everything,” Miller wrote to McHugh.

Miller shared with the former editor links to InfoWars, a far-right site that promotes conspiracy theories, and VDare, which publishes white nationalist ideology, according to the emails.

In one exchange from September 2015, Miller references “Camp of Saints,” a dystopian French novel that depicts the decay of Western civilization at the hands of immigrants.

The White House has offered support for Miller as the SPLC has released additional emails. It has dismissed the organization as "discredited," pointing to a defamation lawsuit it settled in 2018.

White House deputy press secretary Hogan Gidley offered a personal defense of Miller in a statement last week.

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“I work with Stephen. I know Stephen. He loves this country and hates bigotry in all forms – and it deeply concerns me as to why so many on the left consistently attack Jewish members of this Administration,” Gidley said.

The White House did not immediately respond to a request for comment about Thursday's letter.

Miller previously worked as an aide to former Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE (R-Ala.) before joining the Trump campaign. In the time since, he has solidified himself as one of the president's longest-tenured and most trusted advisers, crafting policy on immigration and writing speeches.