Transportation Safety Administration chief John Pistole and several senators from both parties defended the new, enhanced airport security screening procedures as necessary in the face of a persistent and evolving terrorist threat in a hearing Wednesday on Capitol Hill. Pistole, calm and confident in the face of an increasing public outcry against the procedures, talked extensively about the repercussions of last year's attempted Christmas Day bombing being the impetus for the enhanced screenings before the Senate Commerce, Science and Transportation Committee, TSA's oversight committee. "We know the terrorists' intent is still there," Pistole testified. "We are using technology and protocols...