In his letters, Mr. Green said the acting United States attorney in San Juan, Rosa Emilia Rodríguez, a career prosecutor, was being backed for the job on a permanent basis by Mr. Acevedo-Vilá’s political adversaries, including one expected to challenge him for governor next year.  Mr. Green complained that the inquiry has been plagued by leaks since Ms. Rodríguez took over on an interim basis last year. In one instance, reporters were tipped off to a search of a local grain business and arrived at the company’s address before federal agents, who then conducted interviews in an area where the reporters could overhear the conversations, which were widely reported the next day.  “My client’s principal complaint,” Mr. Green wrote, “is that virtually every facet of his life as an elected official has been subjected to scrutiny in the course of an apparently unending investigation that appears not to be about specific allegations of misconduct but rather a determined effort to find something, anything, that can be used to prosecute the governor and ruin him politically on the eve of an election.”  Describing the inquiry as “unprofessional” and “more than a bit comical,” Mr. Green said witnesses had been asked whether his client had had a hair transplant or undergone cosmetic surgery, and where he bought his clothes.  Mr. Green declined to discuss the letters or comment on the status of the inquiry, which, so far at least, has not resulted in any charges against the 45-year-old governor. Nor would Ms. Rodríguez comment, a spokeswoman said.  But Brian Roehrkasse, the Justice Department’s spokesman, said: “The prosecutions are run on a day-to-day basis by career prosecutors and federal law enforcement agents. Furthermore, U.S. Attorney Rosa Rodríguez has served for 19 years as a career prosecutor in the Department of Justice.”  Mr. Roehrkasse also said that in the last 10 years, the San Juan office had successfully prosecuted high-ranking members of the main party in opposition to Mr. Acevedo-Vilá’s.  The case involving Mr. Acevedo-Vilá began with accusations of improper fund-raising related to his efforts to retire debts stemming from a successful campaign for resident commissioner, Puerto Rico’s nonvoting delegate to Congress, a post he held from 2001 to 2005. Mr. Acevedo-Vilá says that if there were improprieties, he was unaware of them.  While it is not known what evidence may have emerged that could implicate Mr. Acevedo-Vilá, or exactly what it is that the government is looking for in its broader inquiry, the department’s reputation for evenhandedness has come under attack in recent months. House investigators are examining whether prosecutors under Alberto R. Gonzales, who stepped down as attorney general in September, allowed partisan politics to undermine the department’s independent legal judgments.  The Puerto Rico case is just one of the prosecutions under scrutiny by the House Judiciary Committee. Accusations of prosecutorial misconduct have surfaced in corruption-related cases in Alabama, Michigan, Georgia, Wisconsin and Pennsylvania. Department officials and federal prosecutors have rejected accusations of unfairness, saying their cases are guided solely by the facts and applicable law.  Michael B. Mukasey, the former federal judge nominated to succeed Mr. Gonzales, said at recent confirmation hearings that if approved, he would look into accusations of selective prosecution. But he has avoided commitments to specific cases.  A version of this article appears in print on , on Page A24 of the New York edition with the headline: Puerto Rico’s Governor, Under Inquiry, Sees Politics. Order Reprints| Today's Paper|Subscribe
The Democratic governor of Puerto Rico says he has been improperly made a target of Justice Department prosecutors.