I didn't have any doubts about my choice of career, but I had constant doubts about my ability, yes.
“We will have a border that is open for business, open for tourism, open for legitimate travelers; but that is closed to terrorists and drug pushers and smugglers and others who seek to break the law.”
“Outside of the Constitution we have no legal authority more than private citizens, and within it we have only so much as that instrument gives us. This broad principle limits all our functions and applies to all subjects.”