A recording of GOP operative Roger Stone that he claimed didn’t exist has emerged, and prominent legal experts, former elected officials and pundits are all clamoring for the arrest of the far-right activist. Mediaite published the audio of Stone calling for the assassination of Reps. Jerrold Nadler (D-New York) and Eric Swalwell (D-California) on Friday. The outlet says it obtained the tape via an anonymous source close to Stone, who asked for their name to be withheld out of fear of retribution. In the recording, Stone — a longtime confidant of former President Donald Trump — is heard repeat…