Nope he has to be sworn in first. Then she can take his place.
swalwell
oh no! I forgot schiff
As I recall, it has been argued a few times and I thought the last time they messed with it was that you either had to have at least 1 parent who was a citizen or you had to be born in the United States. Anyone bother to look it up yet? I did a few years ago and I thought that was the conclusion.