The law doesn't apply to tax cases, although in a case against Sakura Global Capital last year he unsuccessfully tried an end-run around this exemption.
The Democratic leaders of Congress, who have pushed unsuccessfully for an end to the war since taking control in January, said the GAO report is fresh evidence the president needs to begin extracting the United States from the now-unpopular conflict.
The federal MTBE mandate was finally phased out in 2006, long after its dangers were known and after the state of California had unsuccessfully appealed to the EPA to end the mandate.