WaPo:

Federal prosecutors investigating efforts to overturn the 2020 election have asked witnesses extensive questions about the actions of Rudy Giuliani, a lawyer for former president Donald Trump — including where he got his information about alleged fraud, what he did in the days around Jan. 6, 2021, and what he knew about the actions coming that day,people who have appeared in front of the grand jury say.

Investigators looking into classified documents taken to Mar-a-Lago, Trump’s Florida home and private club, have sought to force testimony from another Trump lawyer, Evan Corcoran, by saying there is evidence that the former president used the attorney’s legal services in furtherance of a crime.

And prosecutors have repeatedly sought information on the actions of yet another Trump lawyer, Boris Epshteyn, in connection with both classified documents and Trump’s false electors scheme, three people said. They have quizzed multiple Trump attorneys involved with the documents case, including Christina Bobb, Alina Habba and Jesse Binnall, according to the people familiar with the investigation, who spoke on the condition of anonymity to discuss it.

The investigative activity highlights one of the ways in which the Trump probes are unusual and complex — turning some of his many current or former attorneys into witnesses or potential investigative targets. A Trump spokesman said the legal strategy was a sign of weakness in the case against the former president.

The probes are led by special counsel Jack Smith, who was appointed by Attorney General Merrick Garland to insulate the work from political influence. Smith’s pace appears to be quickening as the 2024 presidential election starts to take shape, with Trump once again a candidate and President Biden — Garland’s boss — poised to seek a second term. Trump so far has two declared Republican opponents. Legal experts say that if Smith brings criminal charges against Trump, those charges would likely be pending when the GOP primary debates begin in August.