COVID-19 live updates: Judge rules governor stop banning mask mandates in schools

Memorial Hermann, one of the largest not-for-profit health systems in southeast Texas, said Monday it was forced to close three of its 24-hour emergency rooms in the Houston area "due to the continued COVID-19 surge."

The emergency rooms inside Memorial Hermann's convenient care centers in the Kingwood, Spring and Sienna neighborhoods will remain closed "until further notice."

"Patients who are currently receiving care inside any of these Emergency Rooms will be safely discharged or transferred to another Memorial Hermann facility," the health system said in an announcement on its website. "Members of our community who require emergent care should proceed to another nearby Emergency Center for assistance."

Hawaii Gov. David Ige is urging tourists to stay away from the state, which saw a huge number of visitors over the summer, due to the increase in COVID-19 cases.

“It is not a good time to travel to the islands. I encourage everyone to restrict and curtail travel to Hawaii,” Ige said at a news conference Monday.

The islands are dealing with a big COVID surge due to the delta variant, but have a limited number of hospitals. The governor even suggested that another full lockdown is on the table.

"Is a lockdown on the table? Yes, it would be if the number of cases continues to grow exponentially as it has in the last 10 weeks ... then we will have to take action to limit and ensure that the hospitals aren’t overrun," Ige said Monday.

-ABC News' Gio Benitez

In an interview with ABC News' Linsey Davis, U.S. Centers for Disease Control and Prevention Director Dr. Rochelle Walensky said she hopes unvaccinated Americans are spurred into action following Monday's Food and Drug Administration's approval of the Pfizer COVID-19 vaccine.

Walensky said the FDA is "the gold standard for the safety and effectiveness of these vaccines," and the move  was "powerful signal in the safety and effectiveness."

"We have an extraordinary amount of data, and I'm really pleased that the FDA not just took their time and did the due diligence that needed to be done, but did it quickly and efficiently to bring this to the American people as soon as possible," she said.

Walensky didn't have a timetable for when the Moderna vaccine would get full approval since they haven't submitted its data to the FDA yet.

She did say that the current expectation is that the Pfizer vaccine will be authorized for children ages 5 to 12 by November.

While Walensky said she prefers Americans voluntarily get their shots, she encouraged more vaccine mandates to spur people.

"We've already seen just today many come through so that people will recognize if they were on the fence and they just needed that extra push that these mandates will get them there," she said.

Chicago Mayor Lori Lightfoot announced Monday afternoon that city workers will have to get their COVID-19 vaccines.

Lightfoot said that the city has been working with labor unions over the last several weeks to finalize plans.

"It's for the safety of all involved," she said.

Lightfoot did not immediately reveal a deadline or other details about her order.