How can the world know whether the targets chosen by this president or his successors are truly dangerous terrorists and not just people with the wrong associations? (It is clear, for instance, that many of those rounded up after the Sept. 11, 2001, attacks weren’t terrorists.) How can the world know whether this president or a successor truly pursued all methods short of assassination, or instead — to avoid a political charge of weakness — built up a tough-sounding list of kills?

It is too easy to say that this is a natural power of a commander in chief. The United States cannot be in a perpetual war on terror that allows lethal force against anyone, anywhere, for any perceived threat. That power is too great, and too easily abused, as those who lived through the George W. Bush administration will remember…

A unilateral campaign of death is untenable. To provide real assurance, President Obama should publish clear guidelines for targeting to be carried out by nonpoliticians, making assassination truly a last resort, and allow an outside court to review the evidence before placing Americans on a kill list. And it should release the legal briefs upon which the targeted killing was based.