As the Senate returns from a two-week spring recess Monday, topping its agenda is legislation to try to curb the kind of gun violence that took the lives of 20 first-graders in Connecticut last December.
Recent polls show broad popular support for enhanced background checks and bans on military-style guns and ammunition. But many members of Congress side with gun-rights advocates who oppose such measures.
And those advocates are increasingly making the case that Americans need guns to fight government tyranny.
'A Fringe Idea' Goes Mainstream