In the ongoing battle of the budget, President Obama has done something very cruel. Declaring that this time he won’t negotiate with himself, he has refused to lay out a proposal reflecting what he thinks Republicans want. Instead, he has demanded that Republicans themselves say, explicitly, what they want. And guess what: They can’t or won’t do it.

No, really. While there has been a lot of bluster from the G.O.P. about how we should reduce the deficit with spending cuts, not tax increases, no leading figures on the Republican side have been able or willing to specify what, exactly, they want to cut.