Here is a good discussion of the legal issues in the use of lethal military force when we are NOT at war.
Legal Issues Raised by a Lethal U.S. Military Attack in the Caribbean
->Just Security | More info from EcoSearch
— Climate, Ecology, War and More by Dr. Glen Barry (@bigearthdata.bsky.social) 2025-09-03T22:56:03.506423+00:00
https://www.justsecurity.org/119982/legal-issues-military-attack-carribean/
On Sept. 2nd, the Trump administration announced what it described as a lethal strike against an alleged drug smuggling vessel in the Caribbean. In a post on social media accompanied with a video of the strike, President Donald Trump stated that the attack was against positively identified Tren de Aragua Narcoterrorists. Trump also noted that Tren de Aragua had previously been designated as a foreign terrorist organization (FTO). The social media post also asserted that the strike had occurred in international waters and killed 11 terrorists.
Although the facts are still emerging, the Trump administrations extraordinary lethal attack on this purported smuggling vessel and its vow that the strike was a start of a campaign raise a number of significant potential legal issues. And even apart from these legal concerns, the strike constitutes a deeply troubling gratuitous use of the military that resulted in the unnecessary killing of 11 individuals. ......
A U.S. president may direct the use of military force pursuant to either (1) a congressional authorization for the use of force/declaration of war or (2) inherent authority under Article II of the Constitution, typically as commander in chief of the U.S. military. The scope of the presidents authority to direct the use of force under Article II in the absence of congressional authorization is contested. Although there is broad agreement that the president may use force to repel sudden attack, the U.S. executive branch has taken a much more expansive view of the presidents unilateral war powers.
Here the Trump administration will almost certainly rely solely on Article II of the Constitution as the source of authority for the attack on this vessel. Despite labelling the targets narcoterrorists, there is no plausible argument under which the principle legal authority for the U.S. so-called war on terrorthe 2001 Authorization for the Use of Military Forceauthorizes military action against the Venezuelan criminal entity Tren de Aragua.
Under the executive branchs two-prong test for when a president may use force without congressional authorization, the contemplated operation must advance an important national interest and must not amount to war in the constitutional sense, which the Department of Justices Office of Legal Counsel (OLC) has recognized as an outer limit on the presidents unilateral warmaking authority. That said, OLC precedent marks out remarkably wide latitude, with the first prong in particular having been critiqued as being unconstraining, and it is not clear whether it would have limited the president in this instance even assuming OLC advice was sought before the strike took place.
Further, though Trump and others in his administration have emphasized the prior designation of Tren de Aragua as an FTO, such designation does not by itself convey authority to use force. Nonetheless, such FTO designations are widely and mistakenly perceived as authorizing such action within the executive branch. Thus, designation of Tren de Aragua and a number of other Latin American criminal entities as FTOs in February foreshadowed this weeks attack in the Caribbean, despite providing no actual legal authority for it.
This is a well done legal article that also goes into the use of force if we were at war

I think that trump appears to have committed a crime or war crime in this attack.