On December 16, the state court lawsuit in California by Rocky De La Fuente and the American Independent Party finally was filed. De La Fuente v Padilla, Sacramento Superior Court, 34-2016-002-04821-GDS.
The case had been filed on December 9, but there was a technical glitch with the filing. See here for an explanation of the issues. The lawsuit complains about various violations of the election law relative to De La Fuente (who was denied write-in status in California) and about the presidential ballot.