The Constitution requires the president to spend what Congress has instructed him to spend, to raise only those taxes Congress has authorized him to impose and to borrow no more than Congress authorizes.

If President Obama spends what the law orders him to spend and collects the taxes Congress has authorized him to collect, then he must borrow more than Congress has authorized him to borrow. If the debt ceiling is not raised, he will have to violate one of these constitutional imperatives. Which should he choose?…

The only defensible option for the president if the debt ceiling is not raised is to disregard the debt ceiling. The action would be unconstitutional because it would be illegal. Financial markets might react negatively, but not nearly so negatively as if the United States failed to redeem bonds or to pay interest on its debt.

The president would be attacked. He might even be impeached by the House. But maybe not: the House would then be saying that the president should have illegally failed to pay F.B.I. agents, or school districts, or Medicare doctors. In any case, he would not be convicted by the Senate. And he would have saved the nation from much agony.