WASHINGTON >> Federal prosecutors plan to ask a grand jury to indict President Joe Biden’s son Hunter by the end of the month, according to court documents filed Wednesday.

The exact charges the president’s son would face were not immediately clear, but appeared related to a gun possession charge in which he was accused of having a firearm while being a drug user. He has also been under investigation by federal prosecutors for his business dealings.

U.S. Attorney for Delaware David Weiss, newly named a special counsel in the case, referred to a seeking an indictment before Sept. 29 in a status report required by Judge Maryellen Noreika.

Defense attorneys said Hunter Biden has kept to the terms of an agreement sparing him from prosecution on a felony gun charge if he stays clean and out of trouble.

That agreement, which also contains an immunity clause against federal prosecutions for some other potential crimes, was part of a plea deal on misdemeanor tax offenses that fell apart during a court appearance in July. Defense attorneys argue it remains in force.

News of an possible new indictment comes as House Republicans are preparing for a likely impeachment inquiry of President Biden over unsubstantiated claims that he played a role in his son’s foreign business affairs during his time as vice president.

“If you look at all the information we have been able to gather so far, it is a natural step forward that you would have to go to an impeachment inquiry,” House Speaker Kevin McCarthy told Fox News recently.