Mueller's latest move in the Trump-Russia probe may foreshadow a 'large-scale series of prosecutions'

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FBI Special Counsel Robert Mueller has impaneled a grand jury to investigate Russia’s interference in the 2016 election, the Wall Street Journal reported on Thursday.

The grand jury has been working for several weeks already, according to the Journal, and marks an escalation of the probe into last year’s election meddling and whether President Donald Trump’s campaign team had anything to do with it.

Grand juries “serve as the mechanism by which” criminal charges are initiated, according to former federal prosecutor Alex Whiting, and they have the authority to subpoena documents and witnesses.

“In any complex or long-term criminal investigation, therefore, federal prosecutors will go to the grand jury to compel the production of documents or records,” Whiting wrote in May, “or if they want to force witnesses to testify under oath, which a grand jury subpoena requires unless the witness has a valid privilege not to testify.”

Stephen I. Vladeck, a law professor at the University of Texas who specialises in national security law, told the Journal that the grand jury is “a further sign that there is a long-term, large-scale series of prosecutions being contemplated and being pursued by the special counsel.”

Reuters reported in June that Mueller was taking control over the grand jury investigation into former national security adviser Michael Flynn’s lobbying work for a Turkish businessman last year.

Mueller appears to be widening his investigation into Trump’s associates even further by impaneling a new grand jury beyond the one already called to investigate Flynn, experts say.

“If there was already a grand jury in Alexandria looking at Flynn, there would be no need to reinvent the wheel for the same guy,” Vladeck said. “This suggests that the investigation is bigger and wider than Flynn, perhaps substantially so.”

Whiting, the former federal prosecutor, wrote that grand jury investigations “can last for months or even years, as prosecutors chase down evidentiary leads and amass the documentary and testimonial evidence.”

Mueller has reportedly expanded the probe to examine Trump’s financial history and business dealings, and recently added a 16th lawyer to his team of investigators: Greg Andres, a former DOJ official who managed the department’s program targeting illegal foreign bribery.

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