The alleged Iranian plot to kill the Saudi ambassador, Adel al-Jubeir, has served to underscore that Washington and Riyadh view Tehran as a common enemy. This plot has already heightened both parties’ persisting anxieties over Iran, but the U.S.-Saudi partnership has often tended to reinforce, rather than diminish, each side’s most hawkish tendencies.

After the U.S.-led invasion and occupation of Iraq, Iran developed far greater influence among its allies and coreligionists in Syria, Lebanon, the Palestinian territories and the Gulf States. Demonstrating the fear that Iran’s expanded Shia influence has inspired among Saudi leaders, in February 2007 Foreign Minister Prince Saud Al-Faisal encouraged the United States to strengthen its naval presence in the Persian Gulf, telling a U.S. diplomat that the Saudis would supply the logic for America’s deployment if Washington supplied the pressure.

Of course it is the Kingdom that is alarmed by the possibility of an Iranian SCUD missile attack on Saudi oil facilities; it is the Kingdom that is petrified by the possibility of Iran’s nuclear program posing a threat to the House of Saud’s regional prestige; and it is the Kingdom that has claimed that Shia-Persian Iran has been stage managing the massive, popular uprisings sweeping the region in order to undermine Sunni Arab regimes. If the United States moves to increase the scope of its political, economic and military sticks against Iran, it will only serve to invite further Iranian and Saudi intrigues. It may also encourage Iran and other states like it to seek a nuclear deterrent. Responding swiftly to this alleged plot, as some political pundits have encouraged, will further entangle the United States in an intra-Islamic, Shia-Sunni, Arab-Persian rivalry divorced from America’s vital interests.

As an aside, to shed some new light on the scorn currently being heaped on Iran’s odious regime, let us remember that it is America’s strategic ally—the Kingdom of Saudi Arabia—that remains one of the most oppressive regimes in the Middle East. And as much as folks are fulminating over Tehran’s support for terrorism, in reality it is donors in Saudi Arabia who constitute the most significant source of funding to terrorist groups worldwide.