Not only was Mr. Trump by then president and concerned with weightier matters when Mr. Stone testified before lawmakers in September 2017, Mr. Rogow said, but his campaign a year earlier had merely expressed a natural interest in what WikiLeaks might have in store for Hillary Clinton, Mr. Trump’s Democratic opponent. “There was nothing malignant, nothing corrupt” about the conduct of Mr. Stone or the campaign, he said.

Mr. Stone’s trial in a federal courthouse in Washington has unfolded against the backdrop of the impeachment inquiry into the president underway blocks away on Capitol Hill. As Congress grapples with allegations that Mr. Trump tried to pressure Ukraine to help his 2020 re-election effort, the Stone case has revived the story of how Russian operatives stole tens of thousands of Democratic emails and funneled them to WikiLeaks, which released them at critical points in the 2016 campaign.

Jury deliberations will begin on Thursday, said Judge Amy Berman Jackson, who is overseeing the trial. Mr. Stone is charged with seven felonies that together carry a maximum penalty of 20 years in prison, though a defendant with no criminal history, like Mr. Stone, would almost certainly receive a far lighter punishment if he were found guilty on any counts.

Prosecutors have said Mr. Stone hid dozens of text messages and emails that were pertinent to the House committee’s inquiry; deliberately misidentified the person he dispatched to get in touch with the WikiLeaks founder Julian Assange in late summer 2016; covered up the fact that he tried to obtain stolen Democratic emails from WikiLeaks; and denied that he talked to Trump campaign officials about WikiLeaks’ plans.

Two former senior campaign officials, Rick Gates and Stephen K. Bannon, testified that they and other aides talked to Mr. Stone because he appeared to have inside information from WikiLeaks. Mr. Gates also recounted a July 2016 phone call between Mr. Trump and Mr. Stone, days after WikiLeaks released a trove of documents. As soon as they hung up, Mr. Trump said to Mr. Gates that more information would be coming out.