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FILE - In this Monday, March 14, 2016 file photo, Republican presidential candidate, Donald Trump holds a plane-side rally in a hanger at Youngstown-Warren Regional Airport in Vienna, Ohio. Fear of a changing America is fueling some of the anger playing out publicly around Trump's bid for the GOP presidential nomination, historians Ken Burns and Henry Louis Gates Jr. said Monday. Trump is "speaking to a need and a deep set of fears within a large segment of the American community," added Gates, a Harvard University scholar and host of a genealogy show on PBS. "Those fears need to be assuaged, and policies formulated to meet the needs of those worried about their future," he said. (AP Photo/Gene J. Puskar, File)
FILE - In this Monday, March 14, 2016 file photo, Republican presidential candidate, Donald Trump holds a plane-side rally in a hanger at Youngstown-Warren Regional Airport in Vienna, Ohio. Fear of a changing America is fueling some of the anger playing out publicly around Trump's bid for the GOP presidential nomination, historians Ken Burns and Henry Louis Gates Jr. said Monday. Trump is "speaking to a need and a deep set of fears within a large segment of the American community," added Gates, a Harvard University scholar and host of a genealogy show on PBS. "Those fears need to be assuaged, and policies formulated to meet the needs of those worried about their future," he said. (AP Photo/Gene J. Puskar, File)

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Adviser: Trump not inciting riots

Donald Trump adviser Sarah Huckabee Sanders said Trump was not inciting riots by telling CNN his supporters might riot if he receives the most delegates but does not win the nomination.

Adviser: Trump not inciting riots

Donald Trump adviser Sarah Huckabee Sanders said Trump was not inciting riots by telling CNN his supporters might riot if he receives the most delegates but does not win the nomination.