The letters went to the attorneys general and top election officials in all 50 states. They ask for "a list of all specific cases in which either of your offices has determined that an individual who cast a vote in the federal elections held in November 2016 was legally prohibited from doing so." It seeks the person's name, the date of the prohibited vote, the polling place, the reason that person was barred from voting and the result of any prosecution that followed. The information was requested by Feb. 22.