Congressional officials say they're expecting a more than $5 billion administration request to pay for munitions and other military requirements to combat Islamic State militants who have seized control of large swaths of Iraq and Syria.

The $5.6 billion request was expected to be a top item on the agenda of Friday's meeting between President Barack Obama and congressional leaders. Official details are expected to be delivered to Capitol Hill next week.

The funding comes on top of an earlier $58.6 billion request to cover overseas military operations in the war on terror. It's expected to be addressed in the upcoming lame duck session of Congress.

The officials spoke on condition of anonymity because the request is not yet official.