Without fanfare, the Justice Department’s investigation into former President Donald J. Trump’s attempts to overturn the 2020 election is approaching an important milestone.
After nearly nine months of behind-the-scenes clashes, Mr. Trump’s lawyers have largely lost their battle to limit testimony from some of his closest aides to a federal grand jury. The decisions, in a string of related cases, represent an almost total failure by Mr. Trump to constrain the reach of the inquiry and have strengthened the position of Jack Smith, the special counsel overseeing the investigation, as he builds an accounting of the former president’s efforts to retain power after his defeat at the polls.
Having lost their challenges to grand jury subpoenas and largely failed to limit the scope of their testimony with assertions of executive and attorney-client privilege, a last group of aides is now being forced to answer questions.
On Tuesday, it was Stephen Miller, an adviser and top speechwriter for Mr. Trump, who showed up in Federal District Court in Washington and spent several hours in front of the grand jury. On Thursday, it was John Ratcliffe, the former director of national intelligence. The process could culminate near the end of this month with an appearance by former Vice President Mike Pence.
While questions linger over pending appeals and potential efforts by some of the witnesses to delay things further by invoking the Fifth Amendment, the developments suggest that Mr. Smith is close to finishing the fact-finding phase of his work and is moving closer to a decision about seeking charges against Mr. Trump and others.
There are no clear indications about when Mr. Smith might decide about charges in the case, but he faces pressure on several fronts to keep the process moving.
The political season could be a consideration: The 2024 presidential race is heating up, with Mr. Trump still regarded as the front-runner for the Republican nomination, and the first debate of the G.O.P. primary season has been scheduled for August.
On the legal front, the looming decision by a district attorney in Georgia, Fani T. Willis, on whether to seek indictment of Mr. Trump on charges related to his efforts to overturn his election loss has placed added pressure on Mr. Smith, who must decide whether allowing another prosecutor to go first with similar charges could complicate any prosecution he pursues.