Nineteen urgent care medical clinics were temporarily closed in New Jersey and New York City on Wednesday, according to the firm that operates them, coming after President Joe Biden a day earlier vowed to expand testing for the Omicron variant. “To preserve our ability to staff our sites, we are temporarily closing certain locations effective tomorrow, December 22. It is our hope that closing sites now will best allow us to avoid future closures as this surge continues,” CityMD, an urgent care clinic, said in a statement. The closures were blamed on unspecified staffing issues. CityMD provided a list of locations that would be temporarily shut down. Locations in the Bronx, Brooklyn, Long Island, Manhattan, Queens, Westchester, and New Jersey will be affected. Many of the locations also offer COVID-19 testing, according to the firm’s website. “Thank you for your patience, and for your appreciation of our hard-working teams who are …