President-elect Joe Biden on Tuesday outlined his top three COVID-19 priorities for his first 100 days in office: a 100-day mask-wearing program, 100 million doses of the vaccine into Americans arms in the first 100 days, and getting schools reopened permanently.

"We didn’t get into this mess quickly. We're not going to get out of it quickly," Biden said. "But I'm absolutely convinced that, in 100 days, we can change the course of the disease and change life in America for the better."

Biden warned that distributing the vaccine would be one of the hardest and costliest challenges the country will face and will require the cooperation of Congress.

“We’re gonna need Congress to fully fund vaccine distribution to all corners of the country, to everyone," Biden said. "I'm encouraged by the bipartisan efforts in Congress around a $900 billion economic relief package which I've said is critical, but this package is only a start for more action early next year."

"We'll also need the Trump administration to act now," Biden added, "to purchase the doses it has negotiated with Pfizer and Moderna, and to work swiftly to scale manufacturing to U.S. populations and the world."

ABC News' Molly Nagle contributed to this report.

Washington Gov. Jay Inslee said the state's restriction on social gatherings, restaurants, bars, gyms and religious services will be extended to Jan. 4, 2021.

"We need to buckle down through the holidays," Inslee tweeted.

"The hospitalization projections are scary. We’re already at 80% ICU capacity," Inslee said, adding, "our hospitals are still on the brink."

Washington state has over 184,000 diagnosed COVID-19 cases and at least 2,941 fatalities.

Thirty-five juveniles and 116 adults were arrested at a "super spreader" underground party this weekend in Palmdale, California, said Los Angeles County Sheriff Alex Villanueva.

The sheriff said the party was in clear violation of the governor's stay-at-home order, adding that the party would have been targeted without the pandemic due to allegations of drugs, weapons, prostitution and underage trafficking.

ABC News' Alex Stone contributed to this report.

Massachusetts will roll back its reopening plans on Sunday as cases and hospitalizations rise in the aftermath of Thanksgiving, Gov. Charlie Baker said.

Capacity will be reduced from 50% to 40% in facilities including offices, gyms, places of worship and retail stores, Baker said.

In offices, people must wear masks when they're not alone, and at gyms, customers must wear masks at all times.

Changes are also coming to Massachusetts restaurants. Customers must wear masks at all times except when eating and drinking, and their time at tables will be capped at 90 minutes.

There were 192,299 new cases of COVID-19 confirmed in the United States on Monday, according to a real-time count kept by Johns Hopkins University.

It's the 35th straight day that the U.S. has reported over 100,000 newly diagnosed infections. Monday's tally is less than the country's all-time high of 227,885 new cases confirmed on Dec. 4, according to Johns Hopkins data.

An additional 1,404 deaths from the disease were also registered nationwide on Monday, down from a peak of 2,879 fatalities on Dec. 3, according to Johns Hopkins data.

COVID-19 data may be skewed due to possible lags in reporting over Thanksgiving followed by a potentially very large backlog from the holiday.

A total of 14,954,331 people in the U.S. have been diagnosed with COVID-19 since the pandemic began, and at least 283,746 of them have died, according to Johns Hopkins data. The cases include people from all 50 U.S. states, Washington, D.C., and other U.S. territories as well as repatriated citizens.

Much of the country was under lockdown by the end of March as the first wave of pandemic hit. By May 20, all U.S. states had begun lifting stay-at-home orders and other restrictions put in place to curb the spread of the novel coronavirus. The day-to-day increase in the country's cases then hovered around 20,000 for a couple of weeks before shooting back up over the summer.

The numbers lingered around 40,000 to 50,000 from mid-August through early October before surging again to record levels, crossing 100,000 for the first time on Nov. 4 and reaching 200,000 for the first time on Nov. 27.