Michael Moore has hit back at the Bush administration, which has launched an investigation of his recent trip to Cuba, during which he took 9/11 responders to hospitals for treatment. The trip was filmed for his upcoming documentary Sicko, which is due to be screened next week at the Cannes Film Festival. In a letter sent to Treasury Secretary Henry Paulson on Friday and posted on the liberal website The Daily Kos, Moore said, "For five and a half years, the Bush administration has ignored and neglected the heroes of the 9/11 community. ... I understand why the Bush administration is coming after me -- I have tried to help the very people they refuse to help, but until George W. Bush outlaws helping your fellow man, I have broken no laws and I have nothing to hide."