Trump has signed more controversial foreign policy 'executive orders' like the one for moving the US embassy to Jerusalem, the granting of Syrian Golan to Israel, the abolishing of Iran deal, Climate Change withdrawal, and many others, he totally disrespects the Congress and they are spineless or maybe accomplices.
This might help you understand the notion behind Trump's decision, though complicated but in relations to previous acts he must have very bad advisers: https://edition.cnn.com/2019/12/10/politics/trump-order-judaism-nationality/index.html