For three years, President Trump's supporters have insisted that whatever his other flaws, he is at least no warmonger, unlike his more establishment alternatives in thrall of "the blob," the foreign policy establishment whose consensus rules Washington regardless of public opinion. That was never true. But the assassination last night of Iranian Gen. Qassem Soleimani, commander of the elite Quds Force, has put America on the precipice of a major new conflict, proving that Trump was at best a fickle warrior against "endless war."