(CNN) The Justice Department watchdog briefed a bipartisan group of lawmakers Tuesday on its investigation into the FBI's actions during the 2016 election, including its probe into Hillary Clinton's emails.

Justice Department Inspector General Michael Horowitz is nearing the conclusion of the investigation, which includes scrutiny of the actions of senior officials, such as former FBI Director James Comey and former FBI Deputy Director Andrew McCabe.

Horowitz met Tuesday with House Oversight Chairman Trey Gowdy, R-South Carolina, the panel's top Democrat, Elijah Cummings of Maryland, House Judiciary Chairman Bob Goodlatte, R-Virginia and top Democrat Jerry Nadler of New York.

Gowdy, who confirmed the meeting took place, said it was "useful" and "objective," but declined to comment further.

In the fall, Republicans on House Oversight and Judiciary Committees launched their own investigation into the FBI and Justice Department's handling of the Clinton email probe. The committees have held two closed-door interviews, with former FBI Deputy Director Andrew McCabe and James Rybicki, who served as Comey's chief of staff.

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