The “migration” refers to the movement of people out of the area of fighting or destruction into refugee areas. Not “immigration.”
Here’s a link to the same order signed by Bush in 2005.
http://www.scribd.com/doc/2852301/Administrative-Order-Migration-and-Refugee-Assistance-Act-of-1962-availability-of-funds-Presidential-Determination-No-200523-of-April-29-2005
It also refers to repatriation of people back TO a place they came From. They fled the area to camps, then had to be taken back and fed till they could get there.
Thats what that says to me. The Violence in Gaza was largely Hamas taking over the area. If I am remembering correctly, that was the time of the Lebanon war...