Republican presidential candidate Donald Trump’s latest staff shake-up reflects the growing behind-the-scenes influence of a wealthy backer relatively new in the nominee’s orbit: billionaire hedge-fund manager Robert Mercer. Mr. Mercer, co-chief executive of the hedge fund Renaissance Technologies, has longstanding ties to both people elevated to top posts in the campaign on Wednesday. He and his daughter, Rebekah, had...

Source: Wall Street Journal August 18, 2016 15:45 UTC