Reps. Mark Kirk (R-Ill.) and Brad Sherman (D-Calif.), along with more than 20 key Democratic and Republican lawmakers, introduced bipartisan legislation last week to extend current U.S. sanctions to suppliers, brokers, insurers and tankers carrying gasoline to the Iran – a critical economic vulnerability that could bolster diplomatic efforts to halt Iran's nuclear enrichment activities. Despite its status as a top OPEC nation, Iran lacks the required refining capacity to meet domestic demand for fuel and must import some 40 percent of its gasoline. A similar bill will be introduced in the Senate this week by Sens. Evan Bayh (D-IN), Jon Kyl (R-AZ), and Joseph Lieberman (I-CT).