President Trump is leading America toward war without end in the Middle East

It has come to this. An impeached president — still pending trial in the Senate — orders the assassination of a leading Iranian general as he is meeting with the leader of Iraq, a supposed ally. He does so without consultation, much less approval, of Congress. Besieged at home, he lashes out abroad.

This president ran on the promise to end the “endless wars “in the Middle East. Earlier, he ordered and then wisely called off bombing strikes on Iran, saying that he did not want a war. Now he...