Donald Trump’s hints that he may dispatch the US military to help Israel destroy Iran’s nuclear program has spurred a revolt from his typically faithful America First base, further dividing a party already struggling to unite around the president’s second-term agenda.

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.