Pornographic magazine publisher Larry Flynt is persevering in his legal fight to publicize details about Missouri's execution methods. This follows the November 2013 execution of the white supremacist gunman who left him paralyzed.

A federal district court judge denied Flynt's attempt to intervene in a 2013 lawsuit over Missouri's largely secret execution protocol. The American Civil Liberties Union of Missouri, which represents the Hustler publisher, wants the St. Louis-based 8th U.S. Circuit Court of Appeals to overturn the lower court ruling.

Oral arguments are scheduled for Wednesday.

Joseph Paul Franklin, who targeted blacks and Jews in a three-year cross-country killing spree, shot Flynt in 1978 but was never charged in that attack.

A separate legal challenge to Missouri's execution protocol filed on behalf of Franklin and other death-row inmates endures.