(CNN) President Donald Trump's sons Eric and Donald Trump Jr. employed an undocumented Mexican immigrant at their private hunting retreat, The Washington Post reported on Wednesday.

Juan Quintero, who crossed the US-Mexico border more than two decades ago, worked as a caretaker at the 171-acre hunting retreat called Leather Hill Preserve, owned by the President's sons and other co-owners, the Post reports. He also worked as the greens-keeper at the Trump National Golf Club Hudson Valley in New York, according to the newspaper.

Quintero lost his job at the golf course in January after working there for 18 years, the Post reports, and also lost his job at the hunting retreat.

His firing came shortly after reports that the Trump family relied on undocumented workers for their businesses, even as the President pushes hardline immigration policies and vilifies undocumented immigrants. Quintero's termination came as part of a purge of undocumented workers. In February, the Post reported that the Trump Organization, which is run by Eric Trump and Donald Trump Jr., had fired at least 18 undocumented workers across five New York and New Jersey golf courses over the previous two months.

In an interview with CNN in Spanish, Quintero said he was not fired instantly from the golf course, but that a woman from human resources informed him his "papers were not adequate."

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