Still, he acknowledged, Mr. Trump could try, and it could create “a disgraceful spectacle.”
Initially, Trump campaign aides favored a discreet series of challenges and recount requests, people briefed on the discussions said, saying they would have been long shots but would not have been laughed out of a courtroom.
Now, the effort has been taken over by Mr. Giuliani, who has embraced a scattershot strategy and promoted wild conspiracy theories — even in court proceedings, as he did at a hearing in Pennsylvania this week.
On Thursday, Mr. Giuliani appeared in a cramped room at the Republican National Committee headquarters in Washington, where he and his team of lawyers unspooled a meandering thread of conspiracies, alleging a “centralised” plot of widespread fraud with no evidence. (Though Mr. Giuliani said he had evidence, he said that he could not share it to protect personal identities, and that there were other allegations that “at this point, I really can’t reveal.”)