Chris Christie, the former governor of New Jersey, said in a tweet on Saturday that he had been released from the hospital that morning, one week after testing positive for the coronavirus.
Mr. Christie is one of at least a dozen people who tested positive in the days after attending a Sept. 26 Rose Garden event for Judge Amy Coney Barrett and had huddled with President Trump and his close advisers during debate preparations just days before Mr. Trump tested positive.
Mr. Christie, who is overweight and has a history of asthma, said last week that he had checked himself into Morristown Medical Center in consultation with his doctors.
“I am happy to let you know that this morning I was released from Morristown Medical Center,” he wrote on Twitter. “I want to thank the extraordinary doctors & nurses who cared for me the last week. Thanks to my family & friends fro their prayers.”
He ended his message with an intriguing pledge: “I will have more to say about all of this next week.”
Since the early days of the pandemic, the White House has regularly used rapid coronavirus tests to screen staff members and guests for the coronavirus because they are fast, portable and easy to operate.
These tests, however, frequently miss infections in people without symptoms. Nevertheless, those who tested negative would often skip other precautions, like wearing a mask or social distancing.
And while officials had given the impression that Mr. Trump was getting tested every day, the White House has since conceded that tests were not as frequent and has refused to reveal the last time Mr. Trump tested negative.
Guests at the reception for Judge Barrett were said to be tested. Part of the event was indoors, and photographs show few masks among the guests there, or later in the larger outdoor portion.
The president also huddled with advisers for maskless preparation sessions ahead of the first presidential debate on Sept. 29.
Several of those involved besides Mr. Christie have said they have since tested positive, including Kellyanne Conway, a former White House adviser; Hope Hicks, a current adviser; and Bill Stepien, Mr. Trump’s campaign manager.