Hicks, who serves as counselor to Trump and traveled with him to a rally Wednesday, tested positive Thursday, according to an administration official, who spoke on condition of anonymity to discuss private health information. She is the most senior White House official to test positive so far.

The positive test is yet another reminder that the virus continues to spread, even as Trump has tried desperately to pretend it no longer poses a danger. Since the beginning, he, the White House and his campaign have played down the threat and refused to abide by basic public health guidelines – including those issued by his own administration – such as wearing masks in public and practicing social distancing. Instead, Trump has continued to hold campaign rallies that draw thousands of supporters. The virus has killed more than 200,000 Americans and infected more than 7 million nationwide.

In a statement, White House spokesman Judd Deere said the president “takes the health and safety of himself and everyone who works in support of him and the American people very seriously.”

“White House Operations collaborates with the Physician to the President and the White House Military Office to ensure all plans and procedures incorporate current CDC guidance and best practices for limiting COVID-19 exposure to the greatest extent possible both on complex and when the President is traveling,” Deere said.

Multiple White House staffers have tested positive for the virus, including Katie Miller, Vice President Mike Pence’s press secretary, national security adviser Robert O’Brien, and one of the president’s personal valets.

After earlier positive cases close to the president, the White House instituted a daily testing regimen for the president’s senior aides. Anyone who will be in close proximity to the president or vice president is also tested every day, including reporters.

While the Centers for Disease Control and Prevention recommends that people who have been in close contact with someone with COVID-19 quarantine for 14 days, White House staffers are considered essential workers. CDC’s guidelines for exposed essential workers allows them to return to work if they take precautions, including taking their temperature before going into work, wearing a mask at all times and practicing social distancing.