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"Sin nature in mankind" causes gun violence, not the guns themselves or mental illness, state Sen. Nathan Dahm, R-Broken Arrow, told combative CNN commentator Piers Morgan on Monday night.

Dahm appeared on Morgan's program in connection with a bill Dahm introduced for the upcoming legislative session.

The legislation is called the "Piers Morgan Act," a dig at Morgan's outspoken criticism of the United States' relatively lax gun laws.

Dahm's bill essentially would eliminate all handgun licensing requirements in Oklahoma. Dahm said he opposes all background checks, including those for mental illness and criminal records, as unconstitutional.

"You are welcome to propose those as a constitutional amendment," Dahm told Morgan.

As he is known to do, Morgan frequently cut Dahm off and interrupted him, and Dahm sometimes talked over Morgan.

"Why would you not want to know if someone was mentally insane?" Morgan asked.

"If the key issue in gun deaths is not the guns and it's not mental health, what is it?" Morgan asked.