More: And although the money itself belongs to Iran " the funds are frozen under sanctions " it would be a solution for Mr Trump, who broke his campaign promise and led America to war on Feb 28.
With no country other than Israel by his side militarily, and without any public or diplomatic backing from traditional allies, the US president promised that overwhelming force would bring a swift victory and prevent Iran from obtaining a nuclear weapon.
Instead, with higher oil prices and the chances of a global recession higher than at any time since the 2020 pandemic, peace will probably mean releasing those billions in cash to a regime that, despite Mr Trump's numerous promises and declarations, remains standing.
For the White House, the problem is not only the scale of the payment. It also sends a contradictory and electorally risky message to American voters as Washington's political calendar turns from war into a midterm election cycle.
For starters, the cash does not return a fully fledged peace agreement but something closer to a vague one-page document that provides "the framework for future negotiations".
If that is indeed the case " and statements from both sides in the conflict seem still very much at odds " it will be an endpoint a long way from Mr Trump's starting point.
Announcing the beginning of the war from Mar-a-Lago, his Florida home and resort, the president pledged to destroy Iran's missile industry and eliminate regional terrorist proxies. He also urged the Iranian people to rise up and overthrow the regime.
Yet the one-page outline agreement appears to address none of those objectives, instead leaving them to be discussed during the 30 to 60-day period that is expected to follow. Indeed, on Monday, the president watered down his original demand that Iran's highly enriched uranium be handed over to the United States.
Releasing billions of dollars is as legally difficult as it is politically complex. Just $2bn (1.6bn) of Iran's assets are thought to be frozen in the United States. Much of the remaining money, calculated to be worth about $100bn (80bn), is held in international bank accounts frozen by the United Nations.
To release it, Washington would probably need to waive sanctions, cooperation from foreign governments and a mechanism to guarantee the cash not used by the regime to rebuild its nuclear weapons programme or fund its proxies.
More: Prime Minister Benjamin Netanyahu of Israel said in a statement that he had ordered the Israeli military to attack the southern outskirts of Beirut, known as Dahiya, as part of the widening Israeli campaign against Hezbollah, the powerful Iran-backed militia. Israel has mostly refrained from attacking the city since the U.S.-Iran cease-fire took effect in early April, but it has continued to bombard southern and eastern Lebanon. Hezbollah has fired on both Israeli soldiers in Lebanon and targets in northern Israel.
The announcement by Mr. Netanyahu prompted thousands of residents to flee their homes, clogging the roads out of the area late Monday morning. For many residents, the sudden exodus has become a miserable routine over nearly three years of conflicts between Hezbollah and Israel.