"Trust is your bond, and if people trust you to be a person of your word, that will carry you far in the profession," Jeh Johnson said.
Senators were left frustrated by the Department of Homeland Security's refusal.
Congress must take the lead in condemning and threatening Russia for its efforts to meddle in the U.S. president election.
There have been reports that DHS does not routinely consult social media during the vetting process for visa applications.
While TSA agents hunt for liquids and knives, they are failing to find explosives and guns.
Homeland Security Secretary Jeh Johnson has ordered the acting administrator's reassignment.