A new book on Stephen Miller, the architect of the Trump administration’s unprecedented attack on immigrant communities and the immigration system, describes the White House adviser as a dangerous man bringing white nationalist ideology to the highest levels of government. “This is what shapes the immigration policy,” says Jean Guerrero, author of “Hatemonger: Stephen Miller, Donald Trump, and the White Nationalist Agenda.” Miller, descended from Jewish immigrants, has been obsessed with fighting multiculturalism since his teenage years and has steadily climbed the right-wing political ladder to become one of Donald Trump’s most trusted associates. He is credited with many of Trump’s most vicious anti-immigrant policies, including separating immigrant children from their parents. “Stephen Miller primarily has been targeting families,” says Guerrero. “It becomes clear that for Stephen Miller, this is not about national security, this is not about keeping out criminals. This is about reengineering the ethnic flows into this country to keep Brown and Black families out.”