White House officials wanted to keep Hope Hicks' COVID diagnosis a secret after the close adviser to President Donald Trump tested positive for the disease.
Only a very small circle of people knew that Hicks had tested positive, and senior staff had hoped to keep that information private, reported Bloomberg News, which broke the news of her diagnosis.
It's unclear when and how Hicks, 31, contracted the disease.
Hicks tested positive on Thursday but sees the president on a daily basis and travels with him frequently.
She joined him - and several senior White House aides - on Air Force One on Tuesday to travel to the presidential debate in Cleveland and she was with the president on Wednesday when he traveled to Minnesota.
Hicks was quarantined away from others on the president's plane on the return trip from Minnesota and her diagnosis was confirmed Thursday, an administration official told the Associated Press.
But Trump continued with his schedule Thursday and traveled to and from his Bedminster, New Jersey golf resort to take part in two campaign events. They were held behind closed doors to a select audience.
White House officials wanted to keep Hope Hicks' COVID diagnosis a secret after she tested positive for the disease - above she exits Marine One on Wednesday
Hope Hicks wears a face mask aboard Marine One in mid-September
Last photo: Donald Trump looks bedraggled as he returns to the White House from his helicopter Marine One on Thursday afternoon, hours before revealing that he and the first lady had tested positive for Covid-19. He had attended a fundraiser in New Jersey
Hope Hicks hours before her diagnosis: Hope Hicks, far right, is pictured boarding Marine One on Wednesday. The President was also on board alongside Stephen Miller, second from right, Jared Kushner, center. Her coronavirus diagnosis was announced the next day. They were on their way to Minnesota when this photograph was taken. She started feeling unwell on the way back
Trump then flew then back to the White House later Thursday evening, when it was then publicly confirmed Hicks had the virus.
His social media director Dan Scavino and press secretary Kayleigh McEnany, who were originally set to join him on the Thursday trip, were replaced at the last minute by other aides. Those two had traveled on Tuesday and Wednesday with the president.
It was not until shortly before 1am EST Friday that Trump confirmed he had the virus, writing: 'Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!'
Senior staff have been tested for COVID-19 daily since two people who work at the White House complex tested positive in early May, prompting the White House to step up precautions. Everyone who comes into contact with the president also receives a quick-result test.
Testing for White House staff increased after a military valet who had close contact with the president contracted the virus.
In the same week, Pence's press secretary Katie Miller - who is married to Trump adviser Stephen Miller - also tested positive.
People working around the president at the White House had already been getting regular tests for the coronavirus.
But staff, Secret Service agents, and guests had not been wearing masks in the West Wing.
On May 11, a memo to the president's staff told them to wear face coverings, and discouraged unnecessary visits from other parts of the White House complex