Sessions, who endorsed presumptive GOP presidential nominee Donald TrumpDonald John TrumpNearly 300 former national security officials sign Biden endorsement letter DC correspondent on the death of Michael Reinoehl: 'The folks I know in law enforcement are extremely angry about it' Late night hosts targeted Trump over Biden 97 percent of the time in September: study MORE, criticized Clinton for saying the District of Columbia v. Heller decision, which he said "protects the right of individuals to keep and bear arms," was wrong.
With the death of Supreme Court Justice Antonin Scalia, Sessions said the court is now split, 4-4, in its support of the decision.
"She gets in, she will appoint somebody who changes it, and what that means is it's no longer a personal right to have a gun, but every city, county and state can completely ban firearms in America," he said on "Fox News Sunday."
"This would be the greatest reduction of Second Amendment rights since the founding of the Republic."
Sessions said it was important the American people understand the extent of Clinton's "radical position" on the issue.
Sessions also called the list of potential Supreme Court nominees Trump released last week a "really fine list" of "accomplished" people.