International Aspects
The Trump/MAGA administration has committed international mayhem. The victims are severe damage to United States foreign relations and trade. As this tends to fall into the realpolitik realm of diplomacy and war, we will not go further into those topics here.
However, the Trump/MAGA administration has encouraged, overlooked, or itself committed gross crimes (whether measured by international law or by the laws of the nations in which the acts were committed). The following is a short list of examples:
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The murder of Jamal Khashoggi by Saudi agents, an act that has been whitewashed and buried by the Trump/MAGA administrations.
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The transparent efforts by Trump, his Trump Organization, and Jared Kushner to assist the de facto Israeli ethnic cleansing of Gaza in order to support the construction of "luxury" hotels and resorts along the Gaza seashore.
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The bribing of US officials (and their acceptance of those bribes), most notably the "gift" from the state of Qatar of a Boeing 747-400.
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The effectively permanent separation of parents from their children as families sought asylum in the United States.
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TODO - Extend this list
There are several international courts and tribunals. See the Wikipedia article "International court".
Most of these have detailed limits on their jurisdiction and proceedings. And not every nation (particularly the United States) has signed onto the treaties that create these courts and tribunals. But those limits ought not to discourage us from using these tools.
Moreover, each nation-state has almost unlimited authority to bring to justice, in its own national courts, those who come (perhaps not voluntarily) into the territory of that nation. (The limits are things like "diplomatic immunity.")
The US has shown that there are several ways that one country can exert influence over individuals in another country.