During this time "The Post" has also taken traditionally conservative or neoconservative positions on several major issues: economically, it has defended a Republican initiative to allow Social Security personal retirement accounts, and has advocated for several free trade agreements. With respect to foreign policy, it supported the 2003 invasion of Iraq, penning by PBS journalist Bill Moyers' count 27 editorials in favor of the war in the six months preceding the invasion. On environmental issues, "The Post" supported the controversial Keystone XL Tar Sands Pipeline, and Hiatt himself came under fire for refusing to hold "Post" columnist George F. Will accountable for misrepresenting scientific evidence in a column in which Will attacked the veracity of global warming. The column drew criticism from several other "Post" columnists, "The Post"'s scientific reporters, and "The Post"'s ombudsman, as well as from environmental scientists and climatologists.