Breaking update, 4:55 p.m.:

Andi Pringle, the new deputy chief of staff to Mayor Vincent C. Gray, is resigning, according to a source close to the administration.

Pringle has come under fire for voting in the District primary last year even though she lives in Maryland. The source, who was not authorized to speak on the matter, said Pringle was giving Gray her resignation letter Wednesday because she believes she has become a “distraction” in the mayor’s office.

An official statement from the Gray administration was expected Wednesday evening.

Pringle did not immediately return a call for comment.

Earlier Wednesday, Gray (D) spoke publicly on the matter for the first time, saying that he was unaware that Pringle had voted in the District last year. He said he learned of the voting discrepancy in the media. He also said that he only recently learned that Pringle’s business license had lapsed in 2009.

The mayor said the issues had “escaped” a vetting process. “Do I trust her?” he asked, repeating a question posed at his weekly news conference . “She said...she made an honest mistake. I believe her in that instance,” he said, referring to the voting issue.

The voting irregularity was revealed last week by community activist Dorothy Brizill on the Web site Brizill filed a formal complaint Friday with the D.C. Board of Elections and Ethics challenging the legality of Pringle’s vote.

Pringle was conspicuously absent from the news conference, which usually draws several staffers. Gray downplayed the absence and Pringle’s role in his administration as someone who is supposed to fix issues surrounding hiring and vetting. “It's an overstatement to say she was brought in to fix this,” he said. “That's why we have a human resources department.”

Gray said at the news conference that no decision has been made about Pringle’s future in his administration. He said he wants to talk to her further and “collect information.” He said his decision would not await the conclusion of an investigation by the Board of Elections and Ethics.

Pringle said previously in a statement that she continued to have ties to the District even though she had recently moved to Maryland when she voted in the September 2010 primary. Pringle lives in Northern Bethesda but said she plans to move back to the District.