Bannon registered to vote in New York on Oct. 14, 2016, and cast an absentee ballot there, according to New York City elections officials. At the time, he was serving as chief executive of now-President Trump's campaign. But he was also registered in Sarasota County, Fla., where he had been on the voter rolls since Aug. 25 , officials said.

White House officials did not immediately respond to requests for comment.

On the day before the Nov. 8 election, Bannon sent a letter to then-Sarasota County Elections Supervisor Kathy Dent, informing her that he had moved to New York and requesting that he be removed from the rolls, according to a person familiar with the letter who shared details about it with The Washington Post.

Since the letter was sent Nov. 7, it is unlikely it would have arrived before Election Day. However, on Wednesday, Sarasota elections officials said they still had no record of receiving it. "None of us recall getting it," said the current elections supervisor, Ron Turner, who took office in January after previously serving as the agency's chief of staff.