Washington: US President Donald Trump on Friday demanded Iran's "unconditional surrender" as the only acceptable outcome to end hostilities, while promising to help rebuild the country's economy if Tehran complied and installed new leadership.

"There will be no deal with Iran except UNCONDITIONAL SURRENDER," Trump wrote on his Truth Social platform.

The post came as Israel bombarded regime targets in Tehran and Hezbollah positions in Beirut, and Defense Secretary Pete Hegseth said US strikes against Iran were "about to surge dramatically."

Trump said that following any capitulation by the Islamic Republic, the United States and its allies would work to bring Iran "back from the brink of destruction, making it economically bigger, better, and stronger than ever before."

This would be contingent on the installation of what he called "a GREAT & ACCEPTABLE Leader(s)."

He closed with a new slogan - "MAKE IRAN GREAT AGAIN (MIGA!)" - a riff on his "Make America Great Again" political brand.

Israeli warplanes pounded Beirut and Tehran on Friday as Iran launched another wave of retaliatory strikes against Israel and Gulf countries. There was no sign of the war letting up on its seventh day.

The strikes in Lebanon were the heaviest since a 2024 ceasefire ended the last war between Israel and the Iran-backed Hezbollah, who fired rockets at Israel in the opening days of the latest conflict. Tens of thousands have fled Beirut’s suburbs and southern Lebanon after sweeping Israeli evacuation warnings.

The war has escalated to affect more than a dozen countries across the Middle East and beyond. The United States said it had struck an Iranian drone carrier at sea as it waged an unrelenting campaign against the country’s navy that earlier included torpedoing of a warship in the Indian Ocean.

The U.S. and Israel have battered Iran with strikes, targeting their military capabilities, leadership and nuclear program. The stated goals and timelines for the war have repeatedly shifted, as the U.S. has at times suggested it seeks to topple Iran’s government or elevate new leadership from within.

(with inputs from AFP & AP)