Washington (CNN) Federal prosecutors are still weighing whether to bring criminal charges against former FBI Deputy Director Andrew McCabe, and The Washington Post reports that a grand jury has been convened on the matter.

McCabe's attorney, however, remains confident that the former top FBI official will be cleared.

CNN reported in April that the Justice Department's inspector general had referred its findings on McCabe to the US Attorney's office in Washington for possible criminal charges associated with lying to internal investigators.

Citing two people familiar with the matter, The Washington Post reported Thursday that a grand jury has met and summoned more than one witness on the matter. Such a move is regularly used as an investigative tool and does not necessarily mean charges will be brought. The sources declined to identify the witnesses to The Washington Post.

In a statement, McCabe's lawyer Michael Bromwich acknowledged prosecutors' use of a grand jury and questioned the timing of the Post's report.

Read More