"Frankly, when I look at this, I think he was ill-served by his staff," said Ohio Gov. John Kasich, one of Trump's primary rivals. "If I were the president, I'd be very upset with the staff - that they didn't say, 'Hey, wait, hold on a second.' Because that's what executives do. They have people around them that help them to understand, 'Hey, your message is fine but here is what's going to come from it.' "