Sen. Claire McCaskill (D-Mo.) complained Monday she was subject to a very uncomfortable screening by the Transportation Security Administration (TSA). McCaskill tweeted about the experience before boarding a flight on Monday. The senator, who has complained about the TSA's security techniques in the past, tweeted that she was selected for a pat down and that the experience was not a pleasant one. "‪Today in my airport screening, test on my hands was positive," McCaskill wrote to her 89,100 followers. "Got private, more aggressive pat down. OMG. #veryuncomfortable‬."