“Instead, Trump’s description of her periodic renewals in Europe are more consistent with someone traveling on a B-1 Temporary Business Visitor or B-2 Tourist Visa, which typically last only up to six months and do not permit employment."
... While Trump and her husband, Republican presidential nominee Donald Trump, have said she came to the United States legally, her own statements suggest she first came to the country on a short-term visa that would not have authorized her to work as a model. Trump has also said she came to New York in 1996, but the nude photo shoot places her in the United States in 1995, as does a biography published in February by Slovenian journalists."
A Trump campaign spokeswoman told Politico, “Melania followed all applicable laws and is now a proud citizen of the United States.”