The letter, dated March 7 and written by two lawyers at law firm Morgan, Lewis & Bockius LLP, says the Internal Revenue Service has ended its scrutiny of the tax years 2002 through 2008. The agency is continuing to examine returns from 2009 forward, according to the letter.

Trump has been under pressure from political opponents to release his returns. The 2012 Republican presidential nominee, Mitt Romney, in February called on Trump to release the documents, saying they may contain a “bombshell.” Trump is the only remaining major-party candidate for president who hasn’t made at least some portion of his tax returns public.

Trump campaign spokeswoman Hope Hicks didn’t immediately respond to requests for comment.

It’s unclear why the campaign posted the letter Wednesday night, more than three weeks after it’s dated.