“I never said there was no collusion between the campaign or between people in the campaign,” he told CNN. He added: “I said the president of the United States. There is not a single bit of evidence the president of the United States committed the only crime you could commit here, conspired with the Russians to hack” the Democratic National Committee.

[ Trump allies have repeatedly shifted their defense as evidence of contacts with Russians grew.]

Mr. Giuliani’s backpedaling was the latest in a series of conflicting comments he has made about the investigation by the special counsel, Robert S. Mueller III. The evolution of his statements have suggested shifts in the president’s defense strategy, often following developments in the investigations. On Tuesday, prosecutors for the special counsel filed a 200-page, mostly redacted court document related to the case against Mr. Trump’s onetime campaign chairman, Paul Manafort. Among the little information that was not blacked out were details about his relationship with a Russian whom prosecutors have said has ties to Russian intelligence.

The special counsel’s document was in response to a recent filing by Mr. Manafort’s legal team, which inadvertently disclosed that Mr. Manafort had provided his Russian associate with American polling data — details that offer the clearest example yet that the Trump campaign may have tried to coordinate with Russia before the 2016 election.

Mr. Giuliani has previously denied that there was coordination by Trump campaign aides.

“When I say the Trump campaign, I mean the upper levels of the Trump campaign,” Mr. Giuliani said during a July interview with Fox News. “I have no reason to believe anybody else did. The only ones I checked with obviously are the top four or five people.”