Jennifer Rubin, WaPo:
I have probably interviewed New Jersey Gov. Chris Christie more times for more hours than any journalist outside New Jersey. I’ve known him since he started running for governor in 2008. You can understand my shock then when a man who claimed to be serious about public service, who ran on concrete policies and a serious national security platform and who seemed genuinely concerned about an unqualified person becoming president would embrace a know-nothing buffoon like Donald Trump.
Whether damning Trump for ignorance about Vladimir Putin, ridiculing Trump’s idea to ban Muslims coming into the United States or disparaging his other goofy ideas and lack of presidential temperament, Christie made clear that Trump was unfit to be commander in chief. Christie posed as the serious grown-up in this race on national security. That was the essence of his case to the American people.