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Donald and Melania Trump have entered quarantine after learning that top White House aide Hope Hicks has tested positive for COVID-19, the president said late Thursday.

“The First Lady and I are waiting for our test results,” Trump tweeted. “In the meantime, we will begin our quarantine process!”

Hicks has accompanied Trump on several campaign trips in recent days, including to the presidential debate with former Vice President Joe Biden on Tuesday evening and a campaign rally in Minnesota on Wednesday.

While the candidates tackled topics including race relations, climate change and the Supreme Court during Tuesday’s face-off, the coronavirus dominated much of the debate. Trump defended his decision to often appear in public without a facial covering, explaining that he wears a mask “when needed.”

“I think masks are OK,” Trump said, when asked by moderator Chris Wallace why he typically appears in public without wearing one. He pulled out a mask from his suit jacket to show he carried it with him.

“I put a mask on, you know, when I think I need it. Tonight is an example, everybody has had a test,” Mr. Trump said. “I wear a mask when needed. When needed, I wear masks.”

Earlier this week, the world passed a grim milestone when Johns Hopkins University reported that more than 1 million people had died as a result of the novel coronavirus. That revelation came less than a week after the number of deaths linked to COVID-19 in the US surpassed 200,000.

The White House didn’t immediately respond for comment on whether Hicks’ positive test will affect the president’s personal policy on wearing masks in public.