1. July 19, 2006: Vetoed H.R. 810, Stem Cell Research Enhancement Act of 2005, a bill to ease restrictions on federal funding for embryonic stem cell research. Override attempt failed in House, 235-193 (286 needed).
2. May 1, 2007: Vetoed H.R. 1591, U.S. Troop Readiness, Veterans' Care, Katrina Recovery, and Iraq Accountability Appropriations Act, 2007. Override attempt failed in House, 222-203 (284 needed). A later version of the bill that excluded certain aspects of the initial legislation that the President disapproved of, H.R. 2206, was enacted as Pub.L. 110-28 with the President's approval.
3. June 20, 2007: Vetoed S. 5, Stem Cell Research Enhancement Act of 2007.
4. October 3, 2007: Vetoed H.R. 976, An act to amend title XXI of the Social Security Act to extend and improve the Children's Health Insurance Program, and for other purposes.