The White House allegedly refused to cooperate with that investigation, an issue that Warren alluded to in the April 4 letter, addressed to Homeland Security Inspector General John V. Kelly.
Court papers say Zhang was carrying two Chinese passports and had four cellphones, a laptop computer, an external hard drive and a thumb drive containing computer malware.
Zhang Yujing was arrested and charged with making false statements to federal officers and knowingly entering a restricted building - which Mar-a-Lago becomes while Trump is in residence.
A few weeks ago, it was revealed that a Chinese businesswoman named Cindy Yang (Yáng Lì 杨莅), who had founded a chain of sketchy massage parlors in southern Florida, had a controversial side business selling Chinese executives access to Donald Trump's Mar-a-Lago club.
House Intelligence Committee Chairman Adam Schiff said on Wednesday the leadership of the group Zhang identified as her host had "apparent connections" to a Chinese Communist Party unit called the United Front Work Department.
The incident has raised security concerns about who is able to access Trump's private property.
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It's not clear if the malware was purposely installed on the drive or if the USB had been infected without Zhang's knowledge.
Trump further dubbed it as a "fluke situation" and praised the receptionist at the resort who alerted the Secret Service agents after the Chinese woman started behaving in a suspicious manner.
Zhang told one Secret Service agent she was at Mar-a-Lago to use the swimming pool and later told another agent she was there to attend a U.N. Chinese American Association event.
The U.S. Secret Service did not specify what kind of malware, though malware on USBs is also very common and not necessarily remarkable. The Secret Service has tried to blame Mar-a-Lago for the incident, saying that the club is responsible for who is admitted.
In an affidavit filed by federal prosecutors in court this week, a Secret Service agent made multiple references to Zhang's English-language ability. She gained access only because confused security personnel thought she was related to a club member with the (very common) Chinese surname Zhang.
"Thus Zhang could not have any legitimate documentation authorizing her entry to Mar-a-Lago for such a objective", the court document cited Agent Samuel Ivanovich as saying.