Christie, in a statement, said he has recovered from COVID-19 after a week-long stay in a hospital's intensive care unit. He called on all political leaders to advocate for face-coverings, as the practice has become increasingly politicized even as the pandemic has killed more than 217,000 Americans.
"I believed that when I entered the White House grounds, that I had entered a safe zone, due to the testing that and I and many others underwent every day," Christie said. "I was wrong."
VOTE 2020 | The Countdown: Trump, Biden participate in dueling town halls
Christie, who was at the White House for the announcement of Judge Amy Coney Barrett as the president's nominee to the Supreme Court and to a participate in several rounds of Trump's debate prep, seemingly chided the president's attitude toward the disease.
"No one should be happy to get the virus and no one should be cavalier about being infected or infecting others," Christie said.
Trump has since called his illness as "a blessing from god," arguing it exposed him to promising therapeutics. He has also been an inconsistent advocate for mask wearing, holding large rallies of thousands of people where many of supporters do not follow public health guidance to cover their face to prevent the spread of the virus.
"Every public official, regardless of party or position, should advocate for every American to wear a mask in public, appropriately socially distance and to wash your hands frequently every day," Christie said.
WATCH: Eyewitness to a Pandemic
RELATED: New York, New Jersey, Connecticut out-of-state travelers quarantine list
MORE CORONAVIRUS COVID-19 COVERAGE
How coronavirus changed the New York region
Do you have coronavirus symptoms?
What's Open, What's Closed in the Tri-State area
Back to school information
COVID-19 Help, Information. Stimulus and Business Updates
New York City
Westchester and Hudson Valley
abc7NY Phase Tracker: