NRA Chief Executive Wayne LaPierre has told a news conference that lives could have been saved at Sandy Hook Elementary School if security at the school had been armed.
He also told reporters: "The only thing that can stop a bad guy with a gun, is a good guy with a gun."
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The PM faces a countdown to settle a deal before her minority government tries to get its Queen's Speech plans approved by the Commons.
More details will come today on proposals to offer EU residents the right to a new "settled status" in Britain after it leaves the bloc.
Scotland and Northern Ireland could see rain later but for the rest of the UK it should be a fine day.