“Boy, that one in the middle was really going after Trump,” Donald Rumsfeld said, adjusting the cuffs of his pinstriped navy blue suit, as he stepped into a sparsely furnished green room at ABC Studios in Manhattan. The former secretary of defense, who at 84 still exudes an air of supreme confidence, had just completed a lengthy — and, at times, awkward — interview on “The View.” Now, addressing one of his assistants, he pointed to a wall mounted with photographs of the show’s co-hosts and fingered the culprit. “The one in the middle” was Joy Behar, who had pressed Rumsfeld to weigh in on allegations that the Trump administration had colluded with the Russians. If it’s true, one of Behar’s colleagues asked, should the president be impeached?