The White House delivered to Capitol Hill on Saturday a formal notification of the drone strike that killed Maj. Gen. Qasem Soleimani as required under the War Powers Act, according to a senior Democratic aide and another official familiar with the matter.

The War Powers Act of 1973 mandates that the president report to lawmakers within 48 hours of introducing military forces into armed conflict abroad. Soleimani, the commander of the Iranian Revolutionary Guard’s elite Quds Force, was killed early Friday morning in Baghdad by a U.S. drone strike, and the Trump administration has said it will send thousands of new troops to the Middle East.

The officials spoke anonymously ahead of the White House’s formal notification to Congress, where Soleimani’s death has already ignited a fresh debate over the president’s war powers and Congress’s role in authorizing new military action abroad.

Such notifications generally detail an administration’s justification for sending U.S. forces abroad, as well as the constitutional and legislative rationale used by the administration to send the troops. It may also include how long the involvement may last.

The document outlining the formal notification received at the Capitol on Saturday is entirely classified, according to the senior Democratic aide, and it is unclear whether the administration will issue a non-classified version that can be publicized.

In remarks at his personal resort in Palm Beach, Florida, President Donald Trump said the Iranian leader was “plotting imminent and sinister attacks” on American personnel abroad.

“Soleimani has been perpetrating acts of terror to destabilize the Middle East for the last 20 years,” Trump said. “What the United States did . . . should have been done long ago. A lot of lives would have been saved.”