Those who know their history also know that the current American administration is of a kind that usually ascends following the rules, but then never voluntarily leaves power.
So I don't think Israel has anything to fear there.
Not only the current administration, no US administration in the recent past or foreseeable future will not be okay with fighting wars for Israel at the cost of American lives and wealth. Some might hesitate or push back more than others, but the end result is the same.
