Belatedly, the president and his allies are trying to establish congressional endorsement for the war through a nonbinding Senate resolution approving “the limited use of military force by the United States in Libya.” But this illustration of the president’s go-it-alone attitude would set a dangerous precedent.

These “sense of the Senate” resolutions are most often used to commemorate non-controversial events such as last month’s resolution celebrating National Train Day — not to authorize a war. The resolution would have no force of law and would not have to be passed by the House. Nonetheless, it would be touted by the administration as evidence of congressional approval for the war.

Passing this resolution would be a profound mistake that would lower the standard for congressional authorization for the use of military force and would forfeit the Senate’s own constitutional role. By setting this precedent in the interests of expediency, Congress would make it far more likely that future presidents will deem a nonbinding vote in one house as sufficient to initiate or continue a war, or marginalize Congress’s involvement in far more consequential war-making decisions than we face now in Libya.