US President Donald Trump has gone into quarantine after his advisor tested positive for COVID-19.
Trump posted on Twitter on Thursday afternoon (local time), saying he and his wife Melania are awaiting their own test results.
"In the meantime we will begin our quarantine process!"
The news follows reports Trump's top advisor, Hope Hicks, returned a positive test result on Thursday.
Hicks travels regularly with the president on Air Force One and accompanied him to Cleveland for the presidential debate earlier this week along with other senior aides.
The White House said in a statement that Trump "takes the health and safety of himself and everyone who works in support of him and the American people very seriously" and that it followed guidelines for limiting COVID-19 exposure to the greatest extent possible.
The Centre for Disease Control recommends anyone who has been in contact with a confirmed case should isolate for 14 days.
The President is expected to attend a second debate with opponent Joe Biden in Florida on October 15 - meaning a race against time to comply with the health standards.
He was also scheduled to appear at a number of rallies over the coming days - all of which will need to be put on hold.
Hicks is the latest person in Trump's circle to contract the virus. In July, National Security Adviser Robert O'Brien tested positive for the virus, which has so far killed 207,000 Americans and infected 7.3 million.
Worldwide deaths from COVID reached a grim milestone this week, with more than 1 million people dying from the virus. So far the novel coronavirus has infected more than 34 million people worldwide.