Campaign chairman Paul Manafort checks the podium before Donald Trump speaks during a June event at Trump SoHo Hotel.
Republican presidential nominee Donald Trump is shaking up his campaign staff, after a series of missteps that led to slumping poll numbers.
04:01 Russia Spent A Fortune Shilling For Trump – And May Not Have Broken Any Laws32
00:31 Trump Demands That Senators Find a Way to Replace Obamacare23
13:26 Why the Cruz amendment is smart policy26
14:44 Trump says he wants victories — but he isn’t selling the GOP agenda to voters29