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- Rudy Giuliani's assistant has been served a subpoena to appear before a federal grand jury, per ABC News.
- The news marks a significant turning point in the ongoing criminal investigation into Giuliani.
- Giuliani's apartment and office were also raided on Wednesday, and the feds seized his electronic devices.
- See more stories on Insider's business page.
A grand jury has been impaneled in the federal investigation into former New York City Mayor Rudy Giuliani, Giuliani's attorney Bob Costello told ABC News.
On Wednesday, Giuliani's New York City apartment, his office, and an office belonging to his associate were searched. Several of Giuliani's electronic devices were seized by federal agents, and a computer belonging to his assistant Jo Ann Zafonte was also taken.
Costello told ABC News that Zafonte was also given a subpoena to appear in front of a federal grand jury in May, related to the federal probe into Rudy Giuliani.
The federal probe is looking at Giuliani's business dealings with Ukraine, specifically to see if the former New York mayor violated foreign-lobbying laws while working with the Trump administration.
This story is developing. Check back for updates.