Mr. Mugica has emerged as an unlikely figure with the power to put the genie back in the bottle. Last week, his lawyer sent scathing letters to the Fox News Channel, Newsmax and OAN demanding that they immediately, forcefully clear his company’s name — and that they retain documents for a planned defamation lawsuit.

He has, legal experts say, an unusually strong case.

And his new lawyer is J. Erik Connolly, who not coincidentally won the largest settlement in the history of American media defamation in 2017, at least $177 million, for a beef producer whose “lean finely textured beef” was described by ABC News as “pink slime.”