[cynwoody]

My understanding is that the chinless yurtle hinted that he may refuse to even seat him.

Can they do that?

Nope. They have to seat him if he is duly elected. See here.

But they can expel him after seating him if they can muster a two-thirds majority.

[Davy Crocket]

But they can expel him after seating him if they can muster a two-thirds majority.

Some Democrats would like to see him stay. So that 2/3 is out the window!