The two-page letter from New York attorney Michael J. Wildes, who has represented Donald Trump's companies, also advanced an alternate timeline for a nude photo shoot that had been cited in news reports as possible evidence of Mrs. Trump working as a model in New York City without authorization.
At issue is whether the photo shoot occurred in 1995 before Mrs. Trump has said she began legally working in the US or in 1996, as Mrs. Trump and Wildes assert.
The letter marks the first time that Mrs. Trump has publicly identified the type of visas she held and gave specifics about her entry into the US.
Mrs. Trump has often said she came to the US legally and used her story to defend Donald Trump's hard line on illegal immigration, an issue that he has made a signature part of his campaign.
In the letter from Wildes, it's unclear whether Mrs. Trump provided him access to her full immigration file during his review. Wildes wrote that he had reviewed a series of news reports and "documents regarding the US immigration history of Mrs. Melania Trump."
But the letter did not indicate which documents.
Trump campaign spokesman Steven Cheung did not immediately respond to detailed questions from The Associated Press about the review and whether Mrs. Trump planned to release her immigration file for public examination.
The immigration file is one of several documents that the Trumps have refused to make public including Donald Trump's tax returns.
In his letter, Wildes dismissed news reports that Mrs. Trump had been professionally photographed posing nude in New York City in 1995.
Last month, the New York Post published the photos along with an article saying they were taken during a two-day photo shoot in Manhattan in 1995.
The Post reported that the photos were then published in the January 1996 issue of the French magazine Max.
But Wildes said that then-Melania Knauss was not in the country in 1995.
"The allegation that she participated in a photo shoot in 1995 is not only untrue, it is impossible," Wildes wrote.
He said he interviewed Mrs. Trump and "we ascertained that the photo shoot in question did not occur until after she was admitted to the United States in H-1B visa status in October 1996.
Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.
As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.
Support quality journalism and subscribe to Business Standard.