What does being a NBC have to do with being seated in Congress? That isn’t a requirement to be a Congressman which is basically breathing.
In the case of William Loughton Smith, Dr. David Ramsey challenged his being seated to the congress because he alleged that William Smith had not been seven years a citizen as was the requirement. Smith was born before the revolution in 1758, and had lived in England before, during and after the revolution, and his Father had died in 1770 as a British Subject.
Ramsey argued that this disqualified him from being an American Citizen because he was born a British Subject and his Father was a British Subject.
Madison argued that when the state of South Carolina (why does trouble always seem to come out of South Carolina?) was made independent of England, the entire society of which William Smith was a part, became American Citizens.
Madison won the Day and Dr. Ramsey's objections were dismissed.