George Bush, the US president, has vetoed for the second time legislation to ease restrictions on federally funded embryonic stem cell research.
Democrats, who had made the stem cell legislation a high priority when they took control of congress in January, face an uphill battle to override the veto.
A two-thirds majority of votes is needed in both legislative houses to overcome Bush's opposition and make the bill law.
Democrats were quick to denounce the president's decision and conceded they are short of support.
Hillary Clinton, senator from New York and a 2008 presidential hopeful, said: "This is just one example of how the president puts ideology before science, politics before the needs of our families, just one more example of how out of touch with reality he and his party have become."
Last Mod: 21 Haziran 2007, 02:44