Source: Rep. Schock, who has resigned, under investigation for possible criminal violations

WASHINGTON – A person familiar with the case tells The Associated Press that the Justice Department is formally investigating whether Rep. Aaron Schock of Illinois, who has submitted his resignation, committed crimes with his office expenditures and business dealings.

The government is convening a federal grand jury in Springfield, Illinois, this source says, and the FBI has started issuing subpoenas to compel people close to the Republican congressman to testify. The source spoke only on grounds of anonymity because the person wasn’t authorized to publicly discuss the case.

Schock abruptly resigned earlier this week following a monthlong cascade of revelations about his business deals and lavish spending on everything from overseas travel to office decor in the style of “Downton Abbey.”