The Attorney General has certified that the interim rule will not have a significant economic impact on a substantial number of small entities because it only affects the federal government operations regarding examination, detention, and removal of aliens from the United States.
The Attorney General stated that this interim rule may be subject to change that could potentially increase its effect of small entities. 
mnli hypothesis: The Attorney General stated that this interim rule may be subject to change that could potentially increase its effect of small entities.  premise: The Attorney General has certified that the interim rule will not have a significant economic impact on a substantial number of small entities because it only affects the federal government operations regarding examination, detention, and removal of aliens from the United States.