MSNBC’s Joe Scarborough ridiculed Donald Trump’s refusal to sit down for an interview with “60 Minutes” like his rival Kamala Harris. The Republican nominee is the first major party presidential candidate not to take part in a sit-down with the CBS News institution since 1968, the year it first aired, and correspondent Scott Pelley told viewers the Trump campaign had offered “shifting explanations” for his refusal to participate. Trump had initially agreed to be interviewed last Thursday, but pulled out. First, he bristled at the revelation he would be fact-checked. Then he said he needed an a…