By having his agencies screw up the terrorist watch list:

A new Justice Department audit shows that for nearly three years the FBI gave outdated, incomplete and error-riddled data about terror suspects to be added to the government’s watchlist.

Overall, the audit by the department’s inspector general gives the FBI a mixed review for its process of nominating names and submitting other information to be included in the terrorist watchlist that is maintained by U.S. intelligence agencies

Think of the people who missed vacations because of the no-fly list. They did nothing wrong, but were punished because of this governments inability to do their jobs. Yeah I know how the right wing loves to lie about there not being a terrorist attack since 9/11 (ignoring things like anthrax), but that was purely by luck. This administration has done nothing to stop terrorism – it’s just a political tool for them.