A top federal prosecutor is set for a closed-door interview with House investigators on Tuesday as part of the GOP’s impeachment inquiry into President Joe Biden, according to two people with knowledge of the plans.

Matt Graves, the U.S. attorney for D.C., is scheduled to appear for a voluntary transcribed interview with the House Judiciary Committee on the same day that the president’s son, Hunter Biden, is arraigned in Delaware on gun charges.

A Justice Department spokesperson did not immediately respond to a request for comment on Graves’ appearance. A Judiciary panel spokesperson declined to comment.

Two IRS agents have told the House panel that Graves declined to team up with U.S. Attorney David Weiss of Delaware, who is supervising the long-running investigation into Hunter Biden. Without that cooperation, Weiss would have been required to seek special authority from Justice Department headquarters in order to work on Graves’ turf.

During the interview, Graves is all but guaranteed to face GOP questions about why he decided against helping Weiss bring a broader case against the First Son.

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