New York City Mayor Bill de Blasio Bill de BlasioThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill New York again pushes back in-person classes The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (D) on Tuesday morning said that he is strongly considering issuing a "shelter in place" order for all city residents as the coronavirus outbreak continues to grow.

"We're absolutely considering that," de Blasio told CNN's Alisyn Camerota.

Mayor Bill de Blasio says he is “absolutely considering” a shelter in place order for New York City residents just like the one instituted in California’s Bay Area on Monday.https://t.co/Od9ItxTsoq pic.twitter.com/a3tf8dtYw6 — New Day (@NewDay) March 17, 2020

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A "shelter in place" order would mandate that all city residents stay in their homes but would fall short of the complete lockdown that is in place in Italy, where people need permission to leave their homes.

At a news conference Tuesday afternoon, de Blasio urged New York City residents to be prepared.

“Even though a decision has not been made by the city or by the state, I think that all New Yorkers should be prepared right now for the possibility of a shelter-in-place order,” de Blasio said

He added that the “very, very difficult” decision would be made within the next 48 hours.

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New York City Mayor de Blasio says there are discussions occurring regarding a potential shelter-in-place order for the city; says he expects to make a decision in the next 48 hours. pic.twitter.com/bEyGXNVBPa — MSNBC (@MSNBC) March 17, 2020

On Monday, six San Francisco-area counties issued a “shelter in place” order. The order is in place until April 7 and encompasses more than 6.7 million people. Residents are still allowed to leave to their homes to shop for essentials, obtain health care assistance and provide for family and friends. They can exercise outside as long as they remain six feet away from people who don’t live with them.

Many states have shuttered bars, restaurants and other places of leisure such as movie theaters as local and federal officials struggle to contain the virus. The Trump administration Monday recommended that people not gather in groups larger than 10. The Centers for Disease Control and Prevention has recommended that there be no gatherings of more than 50 people for the next eight weeks.

There are more than 4,000 confirmed cases of COVID-19 in the U.S., with at least 85 deaths.

--This report was updated at 3:04 p.m.