A spokesman for the lobbying and law firm where Hastert worked in Washington, D.C., said Thursday the former House speaker had resigned.
The website for Dickstein Shapiro LLC had Hastert's biography as a "featured attorney" as late as Thursday afternoon, but Hastert's contact details appeared to have been removed from the website hours later.
Firm spokesman Jason Huntsman did not have further details.
Hastert, a Republican from Illinois, made regular bank withdrawals below a limit that would require reporting and then lied to federal officials when asked about those withdrawals, according to a federal indictment handed down Thursday.
The indictment says Hastert agreed to pay $3.5 million to an unidentified person to hide "prior misconduct" against that person. The indictment does not describe the misconduct Hastert was trying to conceal.