Chris Christie spent a week in ICU after testing positive for COVID-19 in October
The 58-year-old is believed to have contracted the virus at the White House nomination ceremony for Supreme Court Justice Amy Coney Barrett
Christie, who is asthmatic, did not wear a face mask at the event
Now, the prominent Republican is starring in a new ad, urging Americans to don face coverings amid the ongoing pandemic
On Tuesday, America suffered its deadliest day in the pandemic thus far; 3,700 people across the country died from the virus and 250,000 tested positive