As they investigate former President Donald J. Trump’s efforts to overturn the 2020 election, federal prosecutors have also been drilling down on whether Mr. Trump and a range of political aides knew that he had lost the race but still raised money off claims that they were fighting widespread fraud in the vote results, according to three people familiar with the matter. Led by the special counsel Jack Smith, prosecutors are trying to determine whether Mr. Trump and his aides violated federal wire fraud statutes as they raised as much as $250 million through a political action committee by saying they needed the money to fight to reverse election fraud even though they had been told repeatedly that there was no evidence to back up those fraud claims. The prosecutors are looking at the inner workings of the committee, Save America PAC, and at the Trump campaign’s efforts to prove its baseless case that Mr. Trump had been cheated out of victory. In the past several months, prosecutors have issued multiple batches of subpoenas in a wide-ranging effort to understand Save America, which was set up shortly after the election as Mr. Trump’s main fund-raising entity. An initial round of subpoenas, which started going out before Mr. Trump declared his candidacy in the 2024 race and Mr. Smith was appointed by Attorney General Merrick B. Garland in November, focused on various Republican officials and vendors that had received payments from Save America.

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