The 40-year-old adviser to the US president has been the frontman of Trump's recent Greenland grab threats and capture of Nicolas Maduro in Venezuela. How did a kid from liberal Santa Monica become a hardline conservative? And how is his worldview shaping American policy?

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Guest: David Charter, assistant editor, The Times (US).

Host: Rosie Wright.

Producer: Taryn Siegel

Read more: What is ICE? How the controversial agency was formed

Further listening: How Trump became America’s most powerful president

Clips: The Washington Post, CNN, Forbes, Fox News, YouTube / @FiveFools, Univision, Instagram / Cultura Movement, Occupy HLN, YouTube / Clinton Milagro, EWTN.

Photo: Getty Images.

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Who is Stephen Miller? Trump's man behind 'America First'

The Story

Who is Stephen Miller? Trump's man behind 'America First'