West Palm Beach, Florida: A Chinese woman charged with bluffing her way into President Donald Trump's Mar-a-Lago Florida resort last month, renewing concerns about security at the club, appeared in court on Monday at a hearing to determine whether she will remain in custody, according to US media.

The woman, Yujing Zhang, was arrested after giving conflicting reasons for being at the club during one of Trump's routine weekend visits. According to prosecutors, she was carrying four mobile phones, a laptop computer, an external hard drive and a thumb drive containing what investigators described as "malicious malware."

Prosecutors argued in court that concerns about Zhang's trustworthiness and the fact that a search of her hotel room turned up a device to detect hidden cameras, five mobile phone SIM cards and $US8,000 in cash were reasons to keep her in custody, the Washington Post reported.

"She lies to everyone she encounters," the newspaper quoted Assistant US Attorney Rolando Garcia as saying during the hearing.