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Ms. Hicks is the closest person to the president known to have contracted the virus. She traveled with Mr. Trump to the presidential debate in Ohio on Tuesday and accompanied him aboard Air Force One to Minnesota for a campaign rally on Wednesday night.
Officials at the White House have known since Wednesday evening that she had the virus. Her condition was first reported by Bloomberg News, which also said that she had been quarantined on the flight home. It was unclear when she took the test that resulted in a positive diagnosis.
A White House spokesman, Judd Deere, would not comment directly on her condition. “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.”
Ms. Hicks has frequently been seen traveling without a mask, however, a White House official said that she has been one of the few aides to periodically wear masks in meetings.
Gov. Greg Abbott of Texas issued a proclamation on Thursday ordering counties to offer only one location for voters to drop off mail-in ballots in person.
Several counties — including the state’s two largest, Harris County (which includes Houston) and Dallas County — had opened or planned to open satellite drop-off locations in addition to their central election offices. Those satellite locations must close as of Friday.
The state’s decision to reduce options for voters to drop off their ballots comes as questions of voting rights, voter suppression and the integrity of the election have emerged as major issues in the 2020 campaign, and it follows disputes over drop boxes in other states, including Ohio and Pennsylvania.
Courts are examining an order by the Ohio secretary of state which, like Mr. Abbott’s, would allow only one drop-off spot per county. In Pennsylvania, Republicans sought to ban drop boxes entirely, but a court rejected their challenge.
In announcing the change in Texas, Mr. Abbott described it as necessary for security. His spokesman did not immediately respond to a request for comment Thursday afternoon about why the governor considered the satellite drop-offs insecure.
“The state of