India, Feb. 28 -- President Donald Trump is facing backlash domestically after he announced a joint military action with Israel against Iran. Several Congress members raised questions about the 'Act of War' not being authorized before the latest strikes.

This comes after Trump confirmed the attack on Truth Social. In a video, the 79-year-old said that the present regime of Iran would face grave consequences if it does not lay down its weapons.

FOLLOW: Iran US tensions news LIVE: US-Israel strikes on Iran spark conflict across Middle East; 42 killed, Khamenei's residence

"To the members of the Islamic Revolutionary Guard, the armed forces, and all the police, I say tonight that you must lay down your weapons and have complete immunity, ...