The 18 states didn’t join the lawsuit. They joined an amicus brief.
POTUS requested to join (intervened) the lawsuit.
I did not say the 18 states joined the lawsuit. I simply stated Tennessee joined. This was in response to Post 1213 that stated: BRIEF OF STATE OF MISSOURI AND 16 OTHER STATES AS AMICI CURIAEIN SUPPORT OF PLAINTIFF’S MOTION FOR LEAVE TO FILE BILL OF COMPLAINT