On Monday, the president’s lack of a plan in Iran was outlined in stark terms in a letter to Congress obtained by CBS News officially informing lawmakers of the strikes.

“Although the United States desires a quick and enduring peace, it is not possible at this time to know the full scope and duration of military operations that may be necessary,” Trump said in the letter.

U.S. forces “remain postured to take further action… to address further threats and attacks upon the United States or its allies and partners,” he continued.

The letter was sent under the War Powers Act, a 1973 resolution requiring the president to notify Congress within 48 hours of deploying U.S. forces if Congress has not declared war. The deployment cannot last more than 60 days without congressional approval.