Republican candidate Donald Trump says he "felt bad" after being "too rough" on Jeb Bush in his campaign announcement this week. "I think he's a nice person. I actually felt bad because I hit him very hard one day like two days ago, three days ago, and I said, why am I hitting him so hard?" Trump told CNN's Jake Tapper in an interview set to air Sunday during "State of the Union." Trump grilled many of his Republican competitors this week in his announcement speech, dropping the politeness and subtler digs most other politicians stick to and he delivered...