Washington (CNN) A young man was screened by Secret Service agents and permitted to enter a restricted area of President Donald Trump's Mar-a-Lago club last fall, wandering to a common area for members, before being apprehended once agents realized he was neither a member nor a guest.

His unlawful entry came during Trump's Thanksgiving holiday at his Florida property.

The man, Mark Slattery Lindblom, pleaded guilty on Tuesday to "knowingly" entering and staying in a restricted area on Mar-a-Lago on November 23, 2018, the day after Thanksgiving, according to court filings.

The filings say he entered entering Mar-a-Lago through a tunnel and remained at the resort until he was discovered by Secret Service agents. At the time, he was staying with family at a "neighboring beachfront property."

A US Secret Service spokesperson said in a statement that Lindblom had entered the property "after undergoing security screening for weapons and other dangerous items" by Secret Service personnel. During his time on the property, the spokesperson said, Lindblom did not encounter the President or first lady Melania Trump "because of the layered security system in place at the club."

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