'US Destroyer Off the Coast of Iran' The destroyer is painted in Iraqi war camouflage I designed. There is an endless audience of victims in bodybags on the shore. Natasha Mayers, Common Dreams

H.CON.RES 362 calls on the president to stop all shipments of refined petroleum products from reaching Iran. It also "demands" that the President impose "stringent inspection requirements on all persons, vehicles, ships, planes, trains and cargo entering or departing Iran."

Analysts say that this would require a US naval blockade in the Strait of Hormuz.

Since its introduction on May 22 the resolution has attracted 205 cosponsors.

In the Senate, a sister resolution S. RES 580 has gained cosponsors rapidly. The Senate measure was introduced by Indiana Democrat Evan Bayh on June 2. It has now accrued 26 cosponsors.

Congressional insiders credit America's powerful pro-Israel lobby for the rapid endorsement of the bills. The American Israel Public Affairs Committee (AIPAC) held its annual policy conference June 2-4, in which it sent thousands of members to Capitol Hill to push for tougher measures against Iran. On its website, AIPAC endorses the resolutions as a way to "stop Iran's nuclear program" and tells readers to lobby Congress to pass the bill.

Proponents say the resolutions advocate constructive steps toward reducing the threat posed by Iran. "It is my hope that…this Congress will urge this and future administrations to lead the world in economically isolating Iran in real and substantial ways," said Congressman Mike Pence (R-IN), who is the original cosponsor of the House resolution.

Foreign policy analysts worry that such unilateral sanctions make it harder for the US to win the cooperation of the international community on a more effective multilateral effort. In his online blog, Senior Fellow in the Middle East Program at the Center for Strategic and International Studies Ethan Chorin points out that some US allies seek the economic ties to Iran that these resolutions ban. "The Swiss have recently signed an MOU with Iran on gas imports; the Omanis are close to a firm deal (also) on gas imports from Iran; a limited-services joint Iranian-European bank just opened a branch on Kish Island," he writes.

These resolutions could severely escalate US-Iran tensions, experts say. Recalling the perception of the naval blockade of Cuba during the Cuban Missile Crisis, and the international norms classifying a naval blockade an act of war, critics argue endorsement of these bills would signal US intentions of war with Iran.

The sharp rise in the cost of oil following Israeli Deputy Prime Minister Shaul Mofaz's threat to attack Iran earlier this month indicated the impact that global fear of military action against Iran can have on the world petroleum market. It remains unclear if extensive congressional endorsement of these measures could have a similar effect.

In late May, Israeli Prime Minister Ehud Olmert reportedly urged the United States to impose a blockade on Iran. During a meeting with House Speaker Nancy Pelosi (D-CA) in Jersusalem, Olmert said economic sanctions have "exhausted themselves" and called a blockade a "good possibility."

Larry Wilkerson, former Chief of Staff for Colin Powell, disagrees. Iran has already gained the regional power that these resolutions seek to prevent, leaving diplomatic engagement the only way to proceed, he said in a June 7 interview with Real News Network.

"Demographically, military, every way you want to measure hegemony, Iran is the dominant power in the Persian gulf," he said. "Therefore we've got to come to recognize that, we've got to deal with that and hope we can shape that to a responsible role in the gulf and the region, and ultimately in the world. The only way you do that is through diplomacy."

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