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Overview: George Stephanopoulos sits down with the Wall Street Journal reporter to talk about his new memoir, his arrest in Russia on fake espionage charges and life behind bars for nearly a year and a half.

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WATCH: Holiday airfare prices hit highest levels in a decade

Another Trump loyalist tasked to help lead a controversial conspiracy probe targeting President Trump's political foes has resigned from the DOJ, sources say.

Investigators haven't concluded whether the incident was state-backed.

President Trump and the leaders of the country's largest artificial intelligence companies have signed a set of voluntary safety standards, as calls mount for tighter guardrails on powerful AI technology.

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Pro-Trump ad campaign was financed by DHS: Sources

The latest ad features Trump in monochrome,

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Another Trump loyalist helping lead probe into Trump investigations resigns

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