Morales, who earns US$13 an hour, said employees had become increasingly upset by Trump's negative rhetoric about Hispanic immigrants and said a supervisor berated them as "stupid illegal immigrants".
Victorina Morales, a Guatemalan immigrant, says in a bombshell interview that she cleaned Trump's toilet and dusted his golf trophies at the Bedminster club frequently visited by the president.
The self-declared illegal immigrant told the New York Times she was from Guatemala and had sneaked across the US-Mexico border in 1999. It was that, she said, along with abusive comments from a supervisor at work about her intelligence and immigration status, that made her feel that she could no longer keep silent.
Ms Morales described numerous interactions she had with Mr Trump at the Trump National Golf Club in Bedminster, New Jersey, where she said she used fake documents to secure a job easily after working at another hotel before learning of the opening. Diaz explained, "There are many people without papers".
"We have tens of thousands of employees across our properties, and have very strict hiring practices", Amanda Miller, the company's senior vice president for marketing and corporate communications, said in a statement to the outlet.
"The president has been half-serious about stopping illegal immigration by not taking away the jobs magnet", said Roy Beck, president of NumbersUSA, a group pushing to reduce immigration. "We sweat it out and attend to his every need and have to put up with his humiliation".
The Washington Post said in 2015 that it had interviewed workers during the construction of Trump International Hotel in Washington who said they had entered the country illegally.
Her lawyer, Anibel Romero, has called for federal and state investigations into the matter. His golf courses in North Carolina and Doral, Florida, use it, as well as his Mar-a-Lago resort and his hotels in Washington and Chicago. "If any employee submitted false documentation in an attempt to circumvent the law, they will be terminated immediately", a spokesperson for the Trump Organization told Fox News via email.
Fighting undocumented immigration has always been one of the main points of Trump's presidency. "We call upon New Jersey's law enforcement community and federal authorities to investigate these allegations immediately and to help protect these courageous women and others who may now come forward", Romero added.
Morales tells the Times that she was motivated to speak up because she was sick of hearing the president attack undocumented immigrants while on the campaign trail.
The White House declined to comment.
Morales expects she will have to leave her job as soon as her name and work status are made public.
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