Trump's Son Threatened in Bid to Force Dad to Quit Campaign

Law enforcement agencies are investigating a threatening letter containing white powder that was sent to Donald Trump's son, Eric, at his Manhattan residence that said the GOP presidential front-runner's children are in danger if he doesn't drop out of the race.

Sources told CBS News that the Secret Service, FBI, and New York Police Department are all involved in the investigation into the letter, which the younger Trump's wife opened at their apartment at Trump Parc East, located at 100 Central Park South.

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