The former governor of New Jersey confirmed his diagnosis in a tweet Saturday morning.
Christie later consulted with her doctors and said she had checked into a hospital in Morristown, NJ.
“I feel good and have only mild symptoms. We decided it was an important precaution because of my asthma history,” he said.
Christie said “thanks to our hard working medical professionals” and looks forward to returning home.
He is one of several prominent Republicans associated with US President Donald Trump who has done positive tests in recent days.
Christie was part of the team that helped Trump prepare for the presidential debate in Cleveland on Tuesday.
Trump, who was diagnosed Friday morning, is currently being treated at a military hospital as a precaution.
His doctor Sean Conley told reporters Saturday morning that the president was doing “very well” and no longer had a fever.
A man familiar with the Trump situation immediately contradicted that account, saying the president provided supplemental oxygen at the White House on Friday.
Also, Trump’s chief of staff, Mark Meadows, said Friday that the president had gone to a “very relevant” period, and that the next 48 hours would be crucial in his care.
Coronavirus: Trump doctor reports he is doing ‘very well’ after being diagnosed with COVID-19
The circumstances under which Trump caught the virus are not yet clear. Staff member Hope Hicks got his positive test result after suffering with COVID-19.
Many who have traveled with Trump or attended events with the president have been infected with the virus over the past few days.
Doctors say Trump is doing well, but the official says he has gone through a ‘relevant’ period
Those who tested positive included First Lady Melania Trump, former Trump adviser Kellian Conway, campaign manager Bill Stephen, Senators Mike Lee and Thom Tillis, University of Notre Dame President John Jenkins and three White House journalists.
With files from the Associated Press
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