Senators buckled down Tuesday for days of additional negotiations on a response to recent high-profile mass shootings, retreating from earlier calls for quick action even as they expressed optimism that a long-elusive deal to address gun violence might eventually be possible.

The calls for patience came as a small bipartisan group of senators continued delicate talks on a legislative package that could include the first significant new federal gun restrictions in three decades, along with provisions dealing with school security and mental health. But they are fighting a tide of recent history demonstrating that Congress’s appetite for action tends to quickly fade as tragedies such as the killings in Buffalo and Uvalde last month fade from the headlines.

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