Senior Dems force resignation
First, I don't believe he would agree to resign. He would tell them to impeach him or go away....which they won't do.
Second, I don't think there is a chance in hell that the current Democratic leadership would be willing to risk the loyalty of their most consistent voting block.
Look how much trouble they're having getting rid of an 80 year old thoroughly corrupt congressman from Harlem. And you think the Dems would have the guts to go after Obama?
But this is Mr. Kerchner's quest, so I would like to hear how he believes this will play itself out.
Senior Dems force resignation
As the calendar inexorably progresses, the finding of ineligibility would not take place until well into the waning months of Obama's term.
IMHO, that makes any impeachment and conviction process possible, but rather unlikely. As far as "removal" The Constitution Obama disregarded protects him from that. Only Congress can remove a President who does not wish to be removed, by Impeachment in the House, and by Conviction in the Senate by a 2/3 vote.
Resignation demanded by top Dems and Senators? Again possible .... but not likely .... since it would tend to involve discrediting the agenda they shared with Obama ... they are fellow-travelers, or worse. I am reasonably sure they would not want to call attention to that.
It seems that the target has changed from Obama in particular, to upholding of the Constitution in general, so that this travesty cannot occur again. Because of timing, Obama may well become beside the point.
We are living in through an anti-constitutional coup d'état that may ultimately be crushed, but is, right now, in its successful phase.