At one point, the F.B.I. was so serious about its investigation into the server that it asked The Times to delay publication. Meanwhile, reporters had met with a former British intelligence officer who was building the dossier. While his findings were difficult to confirm, Times reporting bore out that he was respected in his craft. And of his material that was checkable, no significant red flags emerged. What’s more, said one journalist frustrated with the process, a covert link seemed like a plausible explanation for the strange bromance between Trump and Putin.