Despite framing the sanctions as an effort to avoid U.S. citizens being tried by the Court for crimes overseas, it's likely the measure is also aimed at dismantling the ICC due to its "anti-Israel bias".
The sanction published by the Department of State reads as follows:
[...]
President Trump will never allow the International Criminal Court to prosecute Americans.
That is why, today, the United States is sanctioning the International Criminal Court. We will ban transactions with this rogue court, cutting off their resources and crippling its ability to operate.
[...] neither the ICC nor States Parties have yet taken meaningful steps to address our concerns.
Despite their inaction, we hold out hope for a diplomatic solution. We have structured this action to provide an opportunity for States Parties to negotiate and present a solution to address our concerns. If these efforts do not bear fruit, we will continue to adjust accordingly.
Our message is clear: the United States and its people are not subject to the jurisdiction of the ICC. [...] Either the ICC will end its threats, or we will end the ICC.
We expect our allies, many of whom are part of the ICC and that rely on American servicemembers for their defense, to rein in the court.
If they do not, the United States will continue its campaign to dismantle the ICC, brick by brick, until Americans are threatened no longer.
@GeoPWatch