Sen. Chris Murphy (D-Conn.) speaks at a news conference on Capitol Hill on June 14. (Jabin Botsford/The Washington Post)
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Senators left Washington on Thursday with key elements still in dispute on a delicate bipartisan deal that could significantly expand federal gun laws for the first time in three decades.

The lack of firm agreement could foil leaders’ hopes of holding a Senate vote on a bill next week, and raised the prospect that a framework agreement released Sunday might not be able to be translated into a bill.