Boris Epshteyn, a longtime Trump adviser, and Mike Roman, a campaign strategist for Trump, had their phones seized last week as evidence, the Times said, citing people familiar with the situation.

Dan Scavino, Trump’s former social media director, was also among those who were subpoenaed, according to the paper, which said the group included low-level aides as well as senior advisers.

An attorney for Scavino did not immediately respond to a request for comment from Reuters, while Reuters was unable to contact Roman and Epshteyn.

The subpoenas seek information on a failed bid by Trump and his allies to overturn the results of the 2020 election by submitting alternative slates of fake electors.

The inquiry is also looking at the Jan 6, 2021, assault on the US Capitol by Trump supporters.

Some of the subpoenas also seek information on Trump’s Save America political fundraising group, which the Times said was a new line of inquiry by the justice department.