Donald Trump blasted President Barack Obama’s senior adviser Robert Gibbs Sunday as “vicious and hateful” after the former press secretary called Trump a “right-wing nut job” on Fox News. Trump told Newsmax. “I built a net worth in excess of $8 billion, built a tremendous company, and have employed tens of thousands of people. I hardly see where I qualify under his definition.” He recently declined an offer to deliver a prime-time speech at the Republican National Convention, but he has been promising to deliver a big “surprise” at the convention in Tampa, Fla., which begins on Aug. 27. “The...