Hope Hicks, one of President Trump’s most senior advisers, has tested positive for the coronavirus, three people familiar with the matter said.
Ms. Hicks is the closest known person to the president to have contracted the virus, which causes Covid-19. She traveled with Mr. Trump on Wednesday aboard Air Force One to Minnesota for a campaign rally in Duluth.
Officials at the White House have known since Wednesday evening that she had the virus. Her condition was reported earlier by Bloomberg News, which also said that she had been quarantined on the return flight to Washington. It was unclear when she took the test that resulted in a positive diagnosis.
Ms. Hicks also traveled with Mr. Trump to the first presidential debate against former Vice President Joseph R. Biden Jr., the Democratic nominee, on Tuesday in Ohio. Attendance at the event was significantly scaled back to prevent the spread of the coronavirus; people familiar with the planning said that Mr. Trump had wanted people in the audience.
That an adviser with such proximity to other advisers has contracted the virus raised alarms inside the White House, where officials worried that other top aides may have been infected.
A White House spokesman, Judd Deere, would not comment directly on Ms. Hicks’s condition on Thursday night.
“The president takes the health and safety of himself and everyone who works in support of him and the American people very seriously,” Mr. Deere said. “White House Operations collaborates with the physician to the president and the White House Military Office to ensure all plans and procedures incorporate current C.D.C. guidance and best practices for limiting Covid-19 exposure to the greatest extent possible both on-complex and when the president is traveling.”
There is no one closer to Mr. Trump than Ms. Hicks, who returned to the White House this year after leaving her position as communications director in 2018. She has overseen significant aspects of the president’s daily schedule, and she works closely with Mr. Trump’s son-in-law and senior adviser, Jared Kushner.
Ms. Hicks was one of the few White House senior aides seen sporadically wearing masks in meetings, according to her colleagues. But she also has been photographed around Mr. Trump without one.
Mr. Trump has faced fierce criticism from health experts and his Democratic opponents for his handling of the coronavirus crisis over the past nine months. The virus has claimed more than 200,000 lives in the United States and has infected more than seven million people, forcing businesses, schools and much of daily life to shut down.
The president repeatedly played down the pandemic in its early days, telling the public that the virus would disappear “like magic” and mocking the recommendation by the Centers for Disease Control and Prevention to wear masks. More recently, Mr. Trump has disregarded advice from his own health experts and has pressured them to produce a vaccine, saying publicly that it would come before Election Day.
Polls show that Mr. Trump’s handling of the pandemic has become a leading issue for many voters as the president looks to win another four years in the White House.
The president has frequently waved aside concerns about contracting the coronavirus, telling reporters — who uniformly wear masks while at the White House — that everyone around him is tested for the virus before they are allowed to be with him.
Reporters who are scheduled to travel with the president are required to get coronavirus tests before they are allowed on Air Force One or into Oval Office meetings. Other visitors are also tested before they are allowed near him.
Two people briefed on the fallout of Ms. Hicks’s positive diagnosis said that several White House officials were going to be required to quarantine after coming into contact with her. But at least one person who had been around Ms. Hicks, the White House press secretary, Kayleigh McEnany, held a news briefing at the White House on Thursday morning.
However, as the president traveled in the afternoon for a fund-raiser at his private club in Bedminster, N.J., he had fewer aides than normal accompanying him, aides said. And some who had been around Ms. Hicks this week were seen wearing masks.
In May, the president revealed that he had taken a two-week course of an antimalarial drug called hydroxychloroquine, which he had frequently promoted as a way to prevent or cure Covid-19. At the time, his doctor said he had not tested positive and had chosen to take the drug as a preventive measure.
Later studies showed that the drug lacked effectiveness. In July, the Food and Drug Administration cautioned against its use. A study announced on Wednesday showed that the drug did not prevent infections among health care workers.
The president and his advisers inside the West Wing have largely shrugged off concerns about contracting the virus, even though three people, including two of his top aides, already have.
Katie Miller, the communications director for Vice President Mike Pence, tested positive for the virus and became ill in May, later revealing that she is pregnant. She returned to the White House at the end of that month. Mr. Trump’s personal military valet also tested positive in May.
Robert C. O’Brien, the president’s national security adviser, tested positive in July. He said he had mild symptoms and self-isolated for a period of time.
But despite those positive cases, Mr. Trump and many of those around him do not regularly wear masks. Mark Meadows, the White House chief of staff, rarely uses one and was photographed interacting with people on a rope line without one.
Mr. Meadows and Mr. Trump say they feel protected because they are tested for the virus daily.
The president’s campaign has also taken few precautions regarding the virus, regularly holding rallies where the president’s supporters, journalists, White House staff, security and others are in proximity for hours. Many of those who attend the rallies, including the president’s staff, do not wear masks.
Most of the rallies have been either outdoors or in airport hangars open to the outdoors. But at least one, in Tulsa, Okla., was held indoors and became what health officials there said was the likely source of a surge in the virus several weeks later.
In addition, eight members of Mr. Trump’s campaign staff who worked at the Tulsa rally tested positive for the coronavirus afterward, raising concerns about an outbreak among people close to the president.