Inspector General Michael Horowitz’s widely anticipated testimony next week before the House Oversight Committee has been postponed, as the Justice Department IG has pursued new leads in his review of the Hillary Clinton email investigation, according to a congressional letter and sources familiar with the matter. 

“It is of the utmost importance that your review be as fulsome, complete and unimpeded as possible,” Rep. Trey Gowdy, R-S.C., the chairman of the committee, wrote in a recent letter to Horowitz obtained by Fox News.

Horowitz was scheduled to appear before the committee on May 8. But Gowdy told Horowitz he wants to reschedule his testimony “as close to the day the report is finalized as is practicable.”

Gowdy said the decision to postpone is based on “the representations” in an April 23 letter from Horowitz.

DOJ Inspector General Michael Horowitz’s widely anticipated testimony has been postponed.

The developments suggest Horowitz is still working to complete his review of the FBI and DOJ's handling of the Clinton case. Sources familiar with the review have told Fox News that Horowitz has continued to pursue new leads and witnesses in recent weeks.