Sen. Lindsey Graham said Donald Trump could "kill 50 on our side and it wouldn't matter."
Graham's remarks were recorded in an upcoming book from two journalists, slated for release later this month.
Trump in January 2016 said he could shoot somebody on Fifth Avenue and "wouldn't lose any voters."
"Trump could kill 50 on our side and it wouldn't matter," Graham told journalists Susan Glasser and Peter Baker, whose new book, "The Divider: Trump in the White House, 2017-2021," details the exchange.
Trump told his supporters in Sioux Center, Iowa.