Twenty-three jurors convened in a federal courthouse in Newark today to hear testimony from a key staff member, Christie press secretary Mike Drewniak, whose lawyer, Anthony Iacullo, said Drewniak was not a target of the investigation.

“We’re here to answer questions and that’s what Michael did today,” Iacullo said.

The convening of the grand jury is evidence that the U.S. Attorney’s investigation has progressed beyond an inquiry and moved to the criminal phase.

The grand jury, which will meet for up to the next 18 months, has the power to indict, subpoena and interview witnesses without their attorney’s present.