President Donald Trump has privately approved war plans against Iran as the country is lobbing attacks back and forth with Israel, The Wall Street Journal reported. But the president is holding off on issuing a final order for now,

President Trump delivered an “ultimate ultimatum” to Iranian leaders to dismantle their nuclear program, he told reporters on Wednesday. But he said he has not made a final decision about whether to strike Iran and draw Washington into a new conflict in the Middle East.

The US president has supported diplomacy, but recent statements suggest he may back military action as coercion.