What a bunch of horse manure!
Session is not mentioned in the Constitution. James Madison maintained to his dying day any state could peacefully secede. He also maintained any attempt by the federal government to use military force to prevent session would be an invasion and not within the power of a federal government.
I am not familiar with these statements by Madison. I am only familiar with two statements by him (40 years apart) that states could *NOT* secede.
If you have a source for these statements by Madison, I would be very interested in seeing it.