Just before 6 p.m. Saturday, Christie said he checked himself into Morristown Medical Center as a precautionary measure due to his history of asthma.
"I am thankful for our hardworking medical professionals and look forward to coming home soon," he said.
On Friday, Christie tweeted he felt fine and had no symptoms.
"I want to thank all who have called and texted in the last few hours to check on my health. I feel fine and have no symptoms," he said. "I was last tested for COVID on Tuesday (it was neg) and was tested this morning. No results until tomorrow. I will let you know the results from here."
Christie's positive test comes after Pres. Trump and First Lady Melania Trump tested positive for the coronavirus.
At least two U.S. Senators, plus a handful of White House aides and officials also tested positive this week.
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