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constitution is sacrosanct. >> reporter: given congressional deadlock even after last year's sandy hook massacre, they're thankful congress is at least on a path to extending the current ban on undetectable arms. >> allowing people to slip through metal detecters with guns to get onto airplanes is not a position that i don't think politicians can take particularly after 9/11. >> reporter: senate democrats will make an attempt next week to close the loopholes and ban new 3-d plastic gun and other weapons that allow people to take metal out and evade metal detecters. privately democrats admit that's not going to pass the senate and likely to extend a simple extension of the current law, loopholes and all. >> aren't a lot of people concerned terrorists could get hands on plastic guns that go through metal detecters and hijack a plane or whatever? >> absolutely. there's no question. a lot of people are concerned. as you just saw, there is a very powerful lobby against expanding and extending this ban.