Pressure mounts on Cawthorn as scandals pile up

The hits are taking a toll. The far-right wing of the party once viewed Mr. Cawthorn, a telegenic congressman who uses a wheelchair after a car crash at the age of 18, as a young leader with potential. Now its members keep him at arm’s length and view him as a troubled individual who isn’t always aligned with the base on the issues.

They describe Mr. Cawthorn as someone who is “Twitter famous,” but who does not work the district and lacks grass-roots support at home. Many of them have noted that even Donald Trump Jr., a popular figure on the right, has stayed quiet and made no attempt to come to his defense.

“I don’t see MAGA voters being quite this forgiving,” said Jason Miller, an adviser to the elder Mr. Trump.