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Constitutional constraints on the regulation of cloning.

In 1995, Congress enacted a ban on federal funding for experimentation with human embryos.1 In 2001, President George W. Bush issued a presidential policy statement extending this funding ban to research on human stem cells extracted from embryos except for research on a limited number of cell lines that had previously been established; 2 he reiterated this position in a 2007 executive order.3 In his 2008 presidential campaign, Barack Obama promised to support stem cell research.4 It now seems likely that in addition to rescinding Bush's executive order,5 Obama will ask Congress to repeal its funding ban from 1995, which still prohibits scientists from generating new stem cell lines. 6