CNN reported on Thursday that two possible incidents on US soil are part of the investigation. One took place in November last year near the Ellipse, the large oval lawn on the south side of the White House, in which an official from the national security council suddenly fell sick.
The other was in 2019 and involved a White House official walking her dog in a Virginia suburb of Washington. That incident was reported in GQ magazine last year.
Officials cautioned that the investigations into these and other incidents have not reached a conclusion.
“The health and wellbeing of American public servants is a paramount priority for the Biden administration. We take all reports of health incidents by our personnel extremely seriously,” a White House spokesperson said.