Threats against the ICC are nothing new, dating back to when the Trump administration sanctioned Karim Khan and other ICC staff. The US, however, is not a member of the ICC and thus has no right to meddle in its business. The ICC does have jurisdiction over Gaza and East Jerusalem, so if it decides to take action against Israel's genocide, it will be justified in the eyes of all 124 ICC member states.
The ICC is prosecuting Israel for defending itself against the worst attack on Jews since the Holocaust, a defensive war in which Israel has bent over backward to ensure it limits civilian casualties and provides humanitarian aid. The ICC should drop this bad faith prosecution and focus on someone like Bashar al-Assad in Syria — who has killed over 500K of his people.