“I wonder why he waited so long.”
He said the question had never come up because he is an American natural born citizen, but he dropped the Canadian one so it wouldn’t cause someone to even bring it up. Being a constitutional expert, he knew he was a natural born American citizen.
He should have known that the courts have never defined what constitutes a "natural born citizen" under the eligibility for President as specified in the Constution. It needs to be adjudicated.