During an interview on the Fox Business Network today, Newt Gingrich said that "Trump is in that kind of a slump”
Trump should focus only on hitting President Barack Obama and Hillary Clinton, and no one else, he said.
"But other than those two people, anytime he talks about anyone else, it is an unforced fumble, if you like, or an interception as I said. But it’s clearly a mistake," Gingrich added. "And until he can discipline himself to be very direct, very controlled — which, frankly, is what you want in a president, because the presidency has so much power. He has enormous potential. I would say that in the last couple weeks, he has been remarkably underperforming. And we’ll see whether or not he can take a deep breath and learn these lessons.”