On Sunday, Speaker Mike Johnson told Fox News that he’ll call a vote in the House on an improved National Defense Supplemental that supplies crucial aid to Ukraine, Israel and Taiwan. The legislation will test the slim and consistently volatile Republican House majority. The GOP needs to make sure to pass it — and prevent President Biden from blaming his own foreign-policy failures on them. For four years, the Trump-Pence administration’s policies effectively thwarted authoritarian aggression abroad by standing in the breach with Ukraine, Israel and Taiwan. Since the Biden-Harris administration took the helm and surrendered in Afghanistan, Russia invaded...