Correspondents dinner shooter case raises concerns about train security

Union representatives and safety consultants say the case of the man charged with attempting to assassinate President Donald Trump at a media dinner is the latest example of someone allegedly trying to use the country's passenger trains to smuggle guns for an attack. They say it won't be the last until ground transportation companies address security and passenger screening. Rail passenger advocates argue that TSA-style checkpoints are impractical at stations. Authorities allege Cole Tomas Allen...