A grand jury has subpoened documents from Halliburton regarding the company’s dealings with Iran. The company, which was formerly headed by Vice President Dick Cheney, set up a subsidiary in the Cayman Islands to skirt U.S. laws that bar companies from dealing with Iran. The grand jury is investigating whether Halliburton broke the U.S. laws on dealing with Iran. U.S. Senator Frank Lautenberg, a Democrat, said the probe should address the role of the Republican vice president. Lautenberg said “The question must be asked: did this possible violation occur between 1995 and 2000 while Dick Cheney was the CEO of Halliburton?”