MIAMI - JUNE 22:  People conduct business with personnel from the Miami Passport Agency June 22, 2007 in Miami, Florida. The Bush administration postponed for at least six months a requirement that Americans who return to the United States by land or sea from Canada, Mexico and the Caribbean must carry passports. The rule, due to go into effect in January 2008, will be delayed until the summer of that year. Getty Images logo Getty Images 59 months ago

MIAMI - JUNE 22: People conduct business with personnel from the Miami Passport Agency June 22, 2007 in Miami, Florida. The Bush administration postponed for at least six months a requirement that Americans who return to the United States by land or sea from Canada, Mexico and the Caribbean must carry passports. The rule, due to go into effect in January 2008, will be delayed until the summer of that year.