Will some kind American soul please explain the 12th Amendment?

I want to understand why Trump & Jan 6 was designed to create chaos. Everyone is saying it was to allow a Martial Law enactment. In an interview Weissman or Katyal said it was for a 12th Amendment win through the House superiority by number of states Republican states. This was Weissman or Katyal's comment the other day on MSNBC. I only caught a minute of the discussion but it's been on my mind since.
#12thAmendment #jan6cmte