1. Trump's comments on abortion, "which would put women in a very difficult position. And we know that he has since moved to correct those in one way or another," Kasich said.
After Trump's initial comments, the front-runner's campaign quickly backtracked, saying only people who perform abortions would be held legally responsible in such cases.
"As a commander in chief and leader of the free world, you don't get do-overs," Kasich added. "You need to be able to get it right the first time."
2. Trump's stance on the use of nuclear weapons both in the Middle East and Europe.
"You wonder about his hand or his thumb getting any close to the critical button that