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ATLANTA, GEORGIA-  FEBRUARY 21: Republican presidential candidate Donald Trump speaks during a campaign rally at the Georgia World Congress Center, Sunday, February 21, 2016 in Atlanta, Georgia.  Trump won the South Carolina Republican primary over nearest rivals Sen. Marco Rubio (R-FL) and Sen. Ted Cruz (R-TX).  (Photo by Branden Camp/Getty Images)
ATLANTA, GEORGIA-  FEBRUARY 21: Republican presidential candidate Donald Trump speaks during a campaign rally at the Georgia World Congress Center, Sunday, February 21, 2016 in Atlanta, Georgia.  Trump won the South Carolina Republican primary over nearest rivals Sen. Marco Rubio (R-FL) and Sen. Ted Cruz (R-TX).  (Photo by Branden Camp/Getty Images)

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Washington Post reporter David Fahrenthold shares his reporting on "The Lead."

Fact-checking Trump on his foundation

Washington Post reporter David Fahrenthold shares his reporting on "The Lead."