WaPo:

Trump’s switch to Florida also tossed a quirky legal puzzle into the mix. Trump — who has traveled to Mar-a-Lago repeatedly as president and has referred to the club as his Winter White House — has said that he voted by mail in Florida’s Republican primary last month. Florida law requires voters to register using their “legal residence” addresses under penalty of perjury.

What would happen to his voting status, some of his adversaries in the dock fight have begun to wonder, if Palm Beach declares that he doesn’t have the legal right to use Mar-a-Lago as his official domicile?

Zeitz called Trump’s possible violation of his agreement with Palm Beach “a substantial and serious potential legal impediment” to the president using Mar-a-Lago as his voter-registration address and official domicile.

In Florida, a state with a long, florid history of voting controversies, a person needs to cross multiple hurdles to legally register at a particular address, according to Ronald Meyer, a Florida lawyer and election law expert, who spoke about the law in general rather than the specifics of Trump’s situation.