. >> while donald trump dom nates the gop side of the race right now, a brand new nbc news poll shows hillary clinton and bernie sanders neck-in-neck among democrats in iowa. clinton leads sanders by three-points. she has an even bigger week, 37 points in south carolina. but in new hampshire, sanders holds a commanding 19 point lead over clinton. that's where she has challenged sanders to another debate. sanders accepted the challenge and both sides wait for the party to sign off. former governor is not polling higher than 3% in iowa, new hampshire or south carolina. >> six d.c. high school students could be charged with felonies for this attack at the gallery-place metro station this morning. it is the latest in a series of assaults in recent months. news 4's megan fitzgerald is live with what metro is going to keep you safe. >> at any given time, there are officers outside metro stations and inside. they say there's thou sands of cameras that earlier this morning, as cameras were rolling and officers were out when a group of teens attacked a man in a metro station. >> there's many t