Last week, our military and intelligence services brought justice to Qassim Suleimani, Iran’s terror mastermind. President Trump ordered General Suleimani’s killing after months of attacks on Americans by Iran’s proxy forces in Iraq. These attacks culminated in a rocket strike that killed an American and wounded others, then the attempted storming of our embassy in Baghdad. The first attack crossed the red line drawn by the president last summer — that if Iran harmed an American, it would face severe consequences. The president meant what he said, as Mr. Suleimani learned the hard way.

Mr. Suleimani’s killing was justified, legal and strategically sound. But the president’s critics swarmed as usual. After the embassy attack, a Democratic senator declared that the president had “rendered America impotent.” Some Democrats then pivoted after the Suleimani strike, calling him “reckless” and “dangerous.” Those are the words of Senator Elizabeth Warren, who also described Mr. Suleimani — the leader of a State Department-designated Foreign Terrorist Organization plotting to kill American troops — as a “senior foreign military official.” Senator Bernie Sanders likened America’s killing of a terrorist on the battlefield to Vladimir Putin’s assassination of Russian political dissidents.