(CNN) The White House invited the top congressional leadership to the White House for a briefing on Iran Thursday afternoon, which the President is expected to attend, according to a source familiar with the plans.

A senior aide told CNN that the briefing will be in the Situation Room.

Top congressional leaders, including House Speaker Nancy Pelosi, Senate Majority Leader Mitch McConnell, House Minority Leader Kevin McCarthy and Senate Minority Leader Chuck Schumer will attend, as will the chairmen and ranking members of the House and Senate intelligence committees, and the chairmen and ranking member of the House and Senate Armed Services Committees.

A US official confirmed to CNN a drone had been shot down, but said the incident occurred in international airspace over the Strait of Hormuz, one of the world's most vital shipping routes. US Central Command, which oversees military operations in the Middle East, said in a statement Thursday that the drone that was shot down by Iran was a RQ-4A Global Hawk High-Altitude, Long, Endurance Unmanned Aircraft System.

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