John Anthony Castro's 14th Amendment Lawsuit
This lawsuit didn't seem serious enough to mention in the initial post, but a tax consultant named John Anthony Castro filed a lawsuit under the 14th Amendment in Texas to get Mr. Trump taken off the ballot.
It's mentioned now because the Supreme Court has declined to hear the case:
A federal judge dismissed Castro's lawsuit in June, finding that he couldn't show legal injury, which prompted him to appeal to the 11th Circuit Court of Appeals and the Supreme Court.