US President George W. Bush pledges to the Mexican people he will continue to try to bring changes to U.S. immigration policy. U.S. President George W. Bush told Mexican President Felipe Calderon in their first summit meeting that he would try to convince Congress to pass his plans to soften U.S. immigration laws and allow a guest worker program. Jon Decker reports.SOUNDBITE: U.S. President George W. Bush; Dan Restrepo, Center for American Progress.