Does it deliver a strong domestic payoff, reversing the position of the Obama administration, boosting international law, and irritating the European Union? In this case, it is probably a foreign policy decision by the Trump government.
Perhaps more important to the US president, the decision on Monday is a gift to conservative evangelical voters supporting Israel on the grounds of biblical prophecy, as well as to its US donors, who also support right-wing politicians in Israel Israel. The government says the change could bring a just peace closer to the Middle East and that it would take a year of legal analysis to reach that decision.
The political leanings of each president naturally influence American foreign policy. But no government lately has been so interested in breaking through permanent positions in US politics, even if there is a risk of US values being violated.