Cawthorn predicted the "Let's Go Brandon" cryptocurrency would "go to the moon" the next day, and sure enough it did.
The North Carolina Republican slammed Cawthorn's "juvenile behavior, outlandish statements, and untruthfulness."
The incumbent was trailing in the polls until the end, but benefited from a scandal involving his Democratic opponent.
Democrats are trying in vain to delay the fast-track confirmation by raising fresh concerns about the safety of meeting during the pandemic.
White House press secretary Kayleigh McEnany has tested positive for COVID-19. Before announcing her diagnosis, she had repeatedly spoken to reporters without a mask.
The cascade of cases appears to be largely linked to the Rose Garden announcement of Amy Coney Barrett's nomination to the Supreme Court.
Reckless disregard for coronavirus safety precautions comes home — and a White House event for Amy Coney Barrett may have been a superspreader event.
Tillis, who attended a White House event on Saturday, is at least the second Judiciary Committee member to test positive for the coronavirus.
"If I can’t afford that dress shirt, I don’t get to get it," the staffer told a three-time cancer survivor.
"I fell short of my own standard," concedes Sen. Thom Tillis (R-N.C.) after telling everyone else to wear a face mask to protect against COVID-19.