It appears Donald Trump and his wife haven’t been socially distancing.
Socially distancing was also an issue for the adviser who passed the infection to him, with Mr Trump explaining Hope Hicks had a “warmness” to the people working with them.
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The President later announced on Twitter that he and the First Lady were going to start the quarantine process.
Mr Trump said it was difficult for him and those close to him to avoid the virus since so many others, including members of the military, tried to interact with them.
“It’s very hard when you’re with soldiers, when you are with airmen, when you’re with the Marines, and the police officers, I’m with them so much,” he told Fox News.
“And when they come over to you, it’s hard to say, ‘stay back, stay back’. You know, it’s a tough kind of a situation, it’s a terrible thing.
“I just went for a test, and we‘ll see what happens. I mean, who knows … I was surprised to hear with Hope, but she’s a very warm person with them.”
Hours later Mr Trump announced his and Melania’s positive test result.
The President’s physician, Sean Conley, released a letter saying he expected Mr Trump to continue his duties.
Ms Hicks, a former White House communications director who returned to the administration as a counsellor to Mr Trump earlier this year, travelled to and from this week’s presidential debate in Cleveland, Ohio with him.
She was also aboard the President’s helicopter, Marine One, for a trip to Joint Base Andrews yesterday. And she was aboard Air Force One for Mr Trump’s visit to Minnesota, where he held a political rally.
A number of other people were on those trips as well.
According to US media, the list of people potentially exposed includes: Ivanka Trump and her husband Jared Kushner, Donald Trump Jr and his girlfriend Kimberly Guilfoyle, Eric Trump and his wife Lara, Tiffany Trump, White House Press Secretary Kayleigh McEnany, adviser Stephen Miller, former New York mayor Rudy Giuliani, White House Chief of Staff Mark Meadows, Congressman Jim Jordan, Trump campaign manager Bill Stepien and criminal justice reform advocate Alice Marie Johnson.
The positive test result will drastically change the presidential election campaign, with the President presumably quarantining for 14 days.
The second debate against Joe Biden is scheduled for October 15, which is 13 days away.