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.
The U.S. Senate was scheduled to begin voting on gun control measures this week when Congress returns from recess, but Senate staffers say a bipartisan agreement has yet to be reached on universal background checks. That snarl may end up delaying a vote on gun legislation for another week, as lobbyists on both sides of the debate use the extra time to keep the pressure on.