HARTFORD, Conn. (AP) — With time running out on the chance to pass gun control legislation, President Barack Obama on Monday warned Congress not to use delaying tactics against tighter regulations and told families of the Sandy Hook Elementary School shooting victims that he’s “determined as ever” to honor their children with tougher laws.

Obama’s gun control proposals have run into resistance on Capitol Hill, leaving their fate in doubt. Efforts by Senate Democrats to reach compromise with Republicans over expanding required federal background checks have yet to yield an agreement, and conservatives were promising to try blocking the Senate from even beginning debate on gun control legislation.

“The day Newtown happened was the toughest day of my presidency,” Obama said in an emotional speech from Connecticut’s capital, an hour’s drive from Newtown. “But I’ve got to tell you, if we don’t respond to this, that’ll be a tough day for me too.”

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