I would not be surprised to see an executive order requiring passports for all people entering and leaving the US by any means.I wouldn't rule anything out, but the current regulations came about following legislation to tighten border entry controls for those entering the country. Even in light of that legislation DHS still provided several exceptions to the requirement to present a passport and of course closed loop cruises is the most commonly talked about on here. DHS determined that a US citizen on a closed loop cruise presents a low risk to the national security, hence the exception. The President might sign an Executive Order asking DHS to re-examine the issue, I'm not sure that an Executive Order would actually supersede existing law and regulation.
Cruise photos: http://www.flickr.com/photos/sparks1093/
NCL Dream CTN May 2008
NCL Sky Bahamas April 2009 http://www.cruisecritic.com/memberre...?EntryID=54257
NCL Sky Bahamas April 2010 http://www.cruisecritic.com/memberre...?EntryID=66539
CCL Pride Bahamas October 2012 http://www.cruisecritic.com/memberre...EntryID=110323
NCL Gem Bahamas May 2014 http://www.cruisecritic.com/memberre...EntryID=255699
CCL Fascination S. Caribbean October 2016 http://www.cruisecritic.com/memberre...EntryID=551888
US Navy, too many to count but included 4 Med cruises (totaling 21 months) 1975-1992
I cruise because that's where the ocean is.
It beats haze gray and underway any day!