Usually, when someone demands a citation of legal precedent, it is because they just got caught doing something so obviously and outrageously wrong that that is their only fallback position. And no, it is not the definition of assault. It is battery, the thing that assault threatens. Battery is defined as "an unpermitted touching" and not "a touching that you should have said no to but didn't because you didn't know it was coming." The as yet unsalted slugs working for the TSA are far too stupid to understand the distinction.