WATCH: Devin Nunes mocked for his fear of fictional cows while wearing a chin-mask aboard an airplane

Rep. Devin Nunes (R-CA) was spotted failing to properly wear a COVID-19 mask aboard an airplane on Tuesday.

Video of posted to Twitter appears to show the person filming the video mocking the California Republican, who was in first-class.

"Sued any cows lately?" she asks, referring to the controversial lawsuit that the lawmaker filed against a fictional cow that goes by @DevinCow on Twitter.

"Moooooooooooooooooo," she said, mimicking a bovine's sound. "Mooooooooooooooooooooooooo."