Story highlights Donald Trump's tax returns from 2009 are being audited, his campaign said

It's unclear if the GOP presidential candidate will release any tax returns

(CNN) Donald Trump on Wednesday released a letter from his tax attorneys attesting that the GOP presidential front-runner's tax filings from 2009 and onward are still being audited by the Internal Revenue Service.

The IRS has, however, completed audits of Trump's tax returns through his 2008 filing. Trump's tax returns have been audited by the IRS each year since 2002, the letter said, and Trump's tax returns between those years "have been closed administratively by agreement with the IRS without assessment or payment, on a net basis, of any deficiency," the lawyers stated.

Photos: The many facial expressions of Donald Trump Photos: The many facial expressions of Donald Trump Many people on the Internet decided that GOP candidate Donald Trump is the most expressive person running for president. Here's a look at his many facial expressions: Hide Caption 1 of 14 Photos: The many facial expressions of Donald Trump Trump speaks about illegal immigration July 10 at the Beverly Wilshire Hotel in Beverly Hills, California. Hide Caption 2 of 14 Photos: The many facial expressions of Donald Trump Trump speaks to guests gathered for a campaign event at the Grand River Center in Dubuque, Iowa, on August 25. Hide Caption 3 of 14 Photos: The many facial expressions of Donald Trump Trump visits his Scottish golf course Turnberry on July 30. Hide Caption 4 of 14 Photos: The many facial expressions of Donald Trump Trump speaks during a rally August 21 at Ladd-Peebles Stadium in Mobile, Alabama. Hide Caption 5 of 14 Photos: The many facial expressions of Donald Trump Trump eats a pork chop on a stick while attending the Iowa State Fair on August 15. Hide Caption 6 of 14 Photos: The many facial expressions of Donald Trump Trump flashes a thumbs-up as he arrives for the start of the first presidential debate August 6 in Cleveland. Hide Caption 7 of 14 Photos: The many facial expressions of Donald Trump Trump participates in the Republican debate in Cleveland. Hide Caption 8 of 14 Photos: The many facial expressions of Donald Trump Trump arrives for jury duty in New York on August 17. Hide Caption 9 of 14 Photos: The many facial expressions of Donald Trump Trump walks his Turnberry golf course on July 30. Hide Caption 10 of 14 Photos: The many facial expressions of Donald Trump Trump at Turnberry on July 30. Hide Caption 11 of 14 Photos: The many facial expressions of Donald Trump Trump talks to the media in Laredo, Texas, during a trip to the Mexico border on July 23. Hide Caption 12 of 14 Photos: The many facial expressions of Donald Trump Trump greets onlookers after taping an interview with Anderson Cooper at a Trump-owned building in New York on July 22. Hide Caption 13 of 14 Photos: The many facial expressions of Donald Trump Trump exits New York Supreme Court after jury duty on August 17. Hide Caption 14 of 14

"Examinations for returns for the 2009 year and forward are ongoing. Your returns for these years report items that are attributable to continuing transactions or activities that were also reported on returns for 2008 and earlier. In this sense, the pending examinations are continuous of prior, closed examinations," Trump's tax attorneys Sheri Dillon and William Nelson said in their letter addressed to Trump.

The letter, published about a month after 2012 Republican nominee Mitt Romney needled Trump about his tax returns , casts doubt over whether Trump will release tax returns for any recent years during the presidential campaign. Trump has argued that he would not do so until the IRS completes its audit, though there is no law preventing Trump from doing so.

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