President Obama should announce that he will raise the debt ceiling unilaterally if he cannot reach a deal with Congress. Constitutionally, he would be on solid ground. Politically, he can’t lose. The public wants a deal. The threat to act unilaterally will only strengthen his bargaining power if Republicans don’t want to be frozen out; if they defy him, the public will throw their support to the president. Either way, Republicans look like the obstructionists and will pay a price.

Where would Mr. Obama get his constitutional authority to raise the debt ceiling?

Our argument is not based on some obscure provision of the 14th amendment, but on the necessities of state, and on the president’s role as the ultimate guardian of the constitutional order, charged with taking care that the laws be faithfully executed.

When Abraham Lincoln suspended habeas corpus during the Civil War, he said that it was necessary to violate one law, lest all the laws but one fall into ruin. So too here: the president may need to violate the debt ceiling to prevent a catastrophe — whether a default on the debt or an enormous reduction in federal spending, which would throw the country back into recession.

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