US President Donald Trump has announced that he and his wife, Melania, have tested positive for the coronavirus.

US President Donald Trump said late on Thursday that he and First Lady Melania Trump have tested positive for Covid-19 and have been quarantined after a top aide tested positive for coronavirus, in a shock development that disrupts his scheduled public appearances in the crucial final weeks of the election campaign.

Trump’s positive test comes just hours after the White House announced that senior aide Hope Hicks came down with the virus after traveling with the president several times this week. Trump was last seen by reporters returning to the White House on Thursday evening and looked to be in good health.

Trump is 74 years old, putting him at higher risk of serious complications from a virus that has now killed more than 200,000 people nationwide. “Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!” Trump tweeted.

In an interview on Fox News, Trump said he and first lady Melania Trump had been tested for the virus and would know the results later on Thursday or Friday.

“I spend a lot of time with Hope, and so does the first lady. And she’s tremendous,” he said.

The president, who is tested regularly for COVID-19, has kept up a rigorous travel schedule across the country in recent weeks, holding rallies with thousands of people in the run-up to the Nov. 3 election, despite warnings from public health professionals against having events with large crowds.

Hicks’ positive test raises the possibility that others within Trump’s immediate circle and at the highest levels of the US government may have been exposed and have to quarantine as well.