U.S. border chief to push trade and travel?

The United States must fight a view that it is hostile to trade and travel and should promote programs making entry easier, the nation's new head of border control said Monday.

Alan Bersin said in his first interview since becoming Customs and Border Protection commissioner that he plans to encourage importers and travelers to give his agency background information to get a fast pass through border checkpoints.

http://www.usatoday.com/news/washington/2010-04-05-border_N.htm

If the "U.S. border chief to push trade and travel", who's job is it to keep out bad and illegal people and things?