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Threatening letter sent to Donald Trump’s sister prompts investigation: Source

Donald Trump's older sister, federal appeals court judge Maryanne Trump Barry, received the letter in Philadelphia on Friday, prompting an investigation.

Donald Trump with his sister Maryanne Trump Barry, during a break in proceedings of the Aberdeenshire Council inquiry into his plans for a golf resort, Aberdeen, northeast Scotland June 10, 2008. (Photo by David Moir/Reuters)
Donald Trump with his sister Maryanne Trump Barry, during a break in proceedings of the Aberdeenshire Council inquiry into his plans for a golf resort, Aberdeen, northeast Scotland June 10, 2008. REUTERS

Katy Tur

Katy Tur is an anchor on MSNBC and a correspondent for NBC News. She is the author of the New York Times best seller "Unbelievable," about her time covering Donald Trump during the 2016 election, for which she also won a Cronkite Award.