On Friday, hospitals in Massachusetts will stop offering elective surgeries that can be safely postponed, Gov. Charlie Baker said at a press conference Monday afternoon.

"This action will free up unnecessary staffing and beds," Baker said. "We all know we're in the midst of a second surge. We're seeing a higher number of new cases each day. And in turn, an increase in hospitalizations statewide."

On Sunday, Massachusetts reported 4,747 new infections and a seven-day average testing positivity rate of 5.3%. There are 1,416 people currently hospitalized with COVID-19.

Despite the worsening statistics, the state is better prepared this time around, Baker insisted. In addition to reallocating hospitals resources, the state is ramping up and winterizing testing sites, stockpiling PPE and preparing two field hospitals in Worcester and Lowell.

-ABC News' Kelsey Walsh contributed to this report.

Navajo Nation begins a three-week emergency lockdown on Monday, during which residents are required to remain at home 24 hours a day, seven days a week.

Essential businesses, including grocery stores, gas stations, laundromats, hay vendors and restaurants providing drive-thru or curbside service, may remain open on weekdays between 7 a.m. and 7 p.m. Off-reservation travel is not permitted and on weekends, a full lockdown will be in place.

"The Navajo Nation’s health care system is in a state of major crisis," Myron Lizer, vice president of Navajo Nation, said in a statement. "We cannot be careless and we have to stay the course."

The rules include exceptions for essential workers and emergency situations. Residents are permitted to leave their homes for essential food, medicine and supplies, as well as outside exercise within the vicinity of their homes and wood gathering.

The lockdown rules will be in effect until Dec. 28.

On Monday, Dr. Anthony Fauci painted a grim future for the United States if Americans don't adhere to public health measures during the holidays. "Without substantial mitigation, the middle of January can be a really dark time for us," Fauci said during a news conference held by New York Gov. Andrew Cuomo.

Americans need to keep social distancing until 75% to 80% of the population can get the COVID-19 vaccine, which would provide an umbrella of community-level protection, Fauci explained. "By the time you get to the beginning of April, you’ll start getting people who have no high priority, just the normal man and woman, New Yorker in the street who's well, has no underlying conditions [getting the vaccine]," he added.

As of Monday, New York State's testing positivity rate was 4.7%, according to Cuomo. The governor estimated that more than 70% of infections spreading in the state were connected to small gatherings.

-ABC News' Rachel Katz contributed to this report.

For the first time since the start of the coronavirus pandemic, the United States is reporting an average of nearly 2,200 deaths from the disease per day, according to an ABC News analysis of data collected and published by The COVID Tracking Project.

The national seven-day average of COVID-19 deaths per day day is currently 2,171. That figure has increased by 139% in the past month.

Last week, there were nearly 15,000 fatalities from the disease recorded nationwide, including five days where the daily death toll surpassed the 2,000 mark. That's roughly equivalent to 88 COVID-19 deaths reported each hour.

Meanwhile, the U.S. has reported over 100,000 new cases of COVID-19 every day for more than a month straight, including three consecutive days where the daily count topped 200,000.

Just in the last month, the national seven-day average of daily new cases has doubled, now averaging 191,736 -- the highest it has been since the beginning of the pandemic.

There were 1,018,657 cases recorded nationwide in the first five days of December. To put that in perspective, it took nearly 100 days from the first recorded COVID-19 case in the U.S. for the country to surpass 1 million confirmed cases.

Hospitalizations continue to surge to unprecedented levels, with over 101,000 patients currently hopitalized with COVID-19 across the country -- a new national record.

In the past two months, current hospitalizations have more than tripled, increasing by 223%.

ABC News' Benjamin Bell, Brian Hartman, Kim Soorin and Arielle Mitropoulos contributed to this report.

The chief science adviser to Operation Warp Speed, the U.S. government's initiative to expedite vaccine development, said he doesn't know what vaccine-related executive order President Donald Trump is expected to sign on Tuesday.

"Frankly, I don't know and, frankly, I'm staying out of this. I can't comment," Dr. Moncef Slaoui told ABC News chief anchor George Stephanopoulos in an interview Tuesday on "Good Morning America."

When pressed on the matter, Slaoui added: "Our work is, you know, rolling. We have plans. We feel that we can deliver the vaccines as needed, so I don't exactly [know] what this order is about."

Trump is expected to discuss the order at a COVID-19 vaccine summit to be held at the White House later Tuesday, multiple White House officials told reporters during a background briefing on Monday evening. While it's not entirely clear on how exactly the order would work, the move is designed to prevent the U.S. government from shipping any vaccine doses it has purchased to aid foreign countries until all the needs within the United States are met.

White House officials also denied reports that the Trump administration turned down an offer last summer to purchase an additional 400 million doses of a COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and that the companies now may not be able to provide more of their vaccine to the United States until June 2021 because they have committed those doses to other countries.

When asked about the matter, Slaoui explained Operation Warp Speed's strategy in securing vaccine doses.

"We selected six different vaccines to build a portfolio to manage the risk that some may work and some may not work, but also to ensure that as more than one would work that we would accumulate vaccine doses from this portfolio of vaccines," he said. "If somebody came to us and said, let's buy more of this vaccine or that vaccine, no one reasonably would buy more from any one of those vaccines because we didn't know which one would work and which one may be better than the other. Once the vaccine's performance becomes known is the right time, given the strategy we've taken, to go and order more vaccine doses, which we may be doing. And frankly, the constructive thing to do if one of the suppliers has challenges producing enough vaccine doses is to roll our sleeves and help ensure that capacity can be increased."

Slaoui said he's confident the U.S. government will be getting vaccines to Americans who need them "as soon as possible" and that plans are "still on track."

"We will work with Pfizer to try and increase capacity and have those vaccines available," he said. "We have two more vaccines from J&J and AstraZeneca that will be completing their Phase 3 trials in January and most likely, I hope, be approved for use in February. We have tens of millions of doses from those vaccines, you know, participating to the volume of vaccines we need to immunize the U.S. population as we promised, all of it by the middle of the year 2021 and that's still on track."

Slaoui said Operation Warp Speed has a meeting with President-elect Joe Biden's transition team scheduled for Thursday.

"We look forward to, you know, sharing all the information and working together," he said. "Our objective has always been outside of politics and making sure we make available these vaccines for the U.S. people, and that's what we're doing."

ABC News' Ben Gittleson, John Parkinson and Eric Strauss contributed to this report.