Former GOP presidential primary candidate Chris Christie balked at endorsing current candidate Nikki Haley in a Tuesday interview on ABC’s “Good Morning America.” “Look, imagine the position I’d be in if I endorsed someone who then turned around and endorsed Donald Trump,” Christie told ABC’s George Stephanopoulos. “I’m not gonna be put in that spot again, George. I made a decision in 2016, the only time in my political career, where I endorsed someone purely for political reasons, even though I had some misgivings.” “And that’s when I endorsed Donald Trump,” Christie continued. “And it was the biggest mistake I’ve...