Trump says campaign chairman Manafort resigns

Paul Manafort resigned as chairman of Donald Trump's U.S. presidential campaign on Friday, Trump said, days after the Republican candidate effectively demoted him in a leadership shakeup aimed at boosting his struggling White House bid. Trump said in a statement he had accepted Manafort's resignation, but did not offer an explanation for the departure. Campaign sources said that Trump had been unhappy with Manafort for a variety of reasons.