Texas attorney general Ken Paxton waded into a battle between the city of Austin and Gov. Greg Abbott Friday over whether the city's four-day late-night indoor dining shutdown should be allowed.

Austin's ban, which was set to run between 10:30 p.m. and 6 a.m. from Dec. 31 until Jan. 3, was upheld by a judge on Thursday. Hours later, at 7:39 p.m. local time on New Year's Eve, the governor released a statement on Twitter telling restaurants to stay open.

Paxton backed the governor on Friday and called for the Texas Supreme Court to halt enforcement of the ban. "We cannot have local declarations conflicting with Gov. Abbott’s clear order," he said in a statement. "I will continue to fight for Texans, small businesses and for an open economy."

-ABC News' Jenna Harrison contributed to this report.

The United States surpassed 20 million coronavirus cases on New Year's Day, with 20,007,149 infections, according to data from Johns Hopkins University.

In different terms, 1 out of every 16 Americans has tested positive for COVID-19.

As the nation's third COVID wave continues, California has emerged as a major epicenter of the U.S. outbreak and at least three states have reported cases of the new COVID variant, which originated in the U.K. Health experts believe it to be more transmissible than the old variant, although it is not thought to be more deadly.

According to JHU, 346,408 Americans had died of the virus as of Friday.

Sen. Mitt Romney criticized the Trump administration's vaccine rollout in a statement he released Friday, writing: "when something isn’t working, you need to acknowledge reality and develop a plan—particularly when hundreds of thousands of lives are at stake."

Relying on states in lieu of developing a federal vaccination plan is "as incomprehensible as it is inexcusable," Romney wrote, and offered up his own suggestions as examples of the brainstorming he said ought to be happening in Washington.

The government should enlist every medical professional not currently delivering care, such as retired veterinarians, combat medics and corpsmen and medical students, to administer vaccines, Romney suggested, noting that they could be paid using the funding Congress has appropriated for states. Additionally, schools could serve as vaccine sites and vaccinations could be scheduled for specific days according to a person's priority category and birthdate.

While public health professionals will easily point out errors in his plan, he said, the nation needs new strategies based on "experience, modeling and trial," especially as the U.S. begins vaccinating more complex populations.

"We are already behind," Romney added. "Urgent action now can help us catch up."

-ABC News' Trish Turner and Chris Howell contributed to this report.

Construction on a 30-bed emergency field hospital is slated to start in western North Carolina Friday, as COVID-19 cases in the state continue to rise.

The facility, which is being built next to Caldwell Memorial Hospital, will treat COVID patients who aren't sick enough to need a ventilator and is meant to relieve pressure on five health systems in the region.

As of Thursday, 3,472 people were hospitalized because of the virus, according to the state health department.

Huntington Hospital in Pasadena, California, released a patient information sheet documenting how they will use their medical resources should they see a shortage due to an overwhelming number of new patients following the holidays.

"We are not currently in this situation, but could be based on ongoing increase in hospitalized COVID-19 patients," they told ABC News, adding that on Sunday they had their highest number of patients (189) in a single day.

In the letter, the hospital explained that due to rising cases of COVID-19 in the community, they may experience limited resources. These include life support machines (like a ventilator or breathing machine), intensive care unit (ICU) beds and healthy medical staff to care for patients.

If there is a shortage of resources, a team of medical professionals will review the cases of all patients who are critically ill to determine how these resources should be shared throughout the hospital.

"If a patient becomes extremely sick and very unlikely to survive his/her illness (even with life-saving treatment) – limited medical resources may go to treat other patients who are more likely to survive," the letter reads.

"Our community is facing a public health emergency that has severely constricted the medical resources available to patients in the Los Angeles County and greater Southern California region. Hospitals such as ours are working hard to meet the dramatic rise in needed care during this COVID-19 surge. We expect to face additional challenges moving forward after the holiday season," the hospital said in a statement.

ABC News' Abigail Shalawylo contributed to this report.