More than 1 million people went through airport security checkpoints across the United States on Sunday for the first time since the start of the coronavirus pandemic.

The Transportation Security Administration said it screened 1,031,505 individuals on Sunday, the most since mid-March. Although that figure is still some 60% lower than this time last year, it's a significant jump from a low of 87,534 people screened on April 14.

ABC News' Sam Sweeney contributed to this report.

Wales will become the second nation in the United Kingdom to enter a lockdown to combat a second wave of COVID-19 infections.

The Welsh government announced on Monday its decision to impose a two-week "firebreak," beginning Friday at 6 p.m. Everyone will be required to stay home and non-essential businesses, such as bars, gyms, restaurants and retail shops, must close until Nov. 9. There will be exceptions for critical workers and those who cannot do their jobs from home.

Libraries and places of worship will also be shut down across the country.

"This is the shortest we can make it, but that means it needs to be sharp and deep to have the impact against the virus we need it to have," Welsh First Minister Mark Drakeford said Monday.

Northern Ireland started a "circuit breaker" lockdown last Friday, closing schools for two weeks while banning most social gatherings and shutting down many business for a month.

Senior Palestinian official Saeb Erekat was placed in a medically induced coma and is listed in critical condition at an Israeli hospital, where he's being treated for COVID-19 complications.

Erekat was transported by ambulance from his home in the Israeli-occupied West Bank to Hadassah Medical Center in Jerusalem on Sunday, more than a week after he had announced testing positive for COVID-19. The 65-year-old has a history of health problems and received a lung transplant in the United States in 2017.

"Mr. Erekat had a quiet night but this morning his condition deteriorated, which is now defined as critical, and due to respiratory distress, he was resuscitated and placed under general anesthesia," Hadar Elboim, a spokesperson for Hadassah Medical Center, told ABC News in a statement Monday.

"Mr. Erekat poses a huge challenge to the treatment of corona as he is lung transplanted with suppression of the immune system, and with bacterial infection in addition to corona," Elboim added. "Hadassah, with its most senior professional physicians, is in international medical contact regarding the policy of treating such a complex patient. Hadassah will continue to update his family as usual regarding his condition and will update the Palestinian Authority as he is a senior official there."

Erekat, who serves as the secretary-general of the Palestine Liberation Organization, is one of the most senior advisors to the Palestinian president. He is a longtime proponent of a two-state solution to the Israeli-Palestinian conflict.

ABC News' Nasser Atta contributed to this report.

New York Gov. Andrew Cuomo said he's not confident in the Food and Drug Administration's approval process for a COVID-19 vaccine, and that the American public shouldn't be either.

"I'm not that confident, but my opinion doesn't matter. I don't believe the American people are that confident," Cuomo told ABC News chief anchor George Stephanopoulos in an interview Monday on "Good Morning America."

"I think it's going to be a very skeptical American public about taking the vaccine, and they should be," he added.

Cuomo said he plans to assemble a group of doctors and medical experts to review any COVID-19 vaccine approved by the FDA before affirming its efficacy and safety for New York state residents.

"But I believe all across the country you're going to need someone other than this FDA and this CDC saying it's safe," he said, before adding that the two federal agencies don't "have any credibility."

The New York governor also expressed concern over comments Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, made during an interview that aired Sunday on CBS' "60 Minutes," in which he admitted that the White House has restricted "many, many, many" of his media appearances since the start of the coronavirus pandemic.

"You have Dr. Fauci now saying that they basically tried to muzzle him," Cuomo said. "He has the highest credibility in the nation on this issue."

The Trump administration has thrown out 45 ventilators that Russia sent the U.S. last spring, the Federal Emergency Management Agency confirmed in a statement Monday.

The ventilators were delivered as part of a medical aid flight sent last spring by Russian President Vladimir Putin to President Donald Trump.

"He offered a lot of medical, high quality stuff that I accepted and that may save a lot of lives. I'll take it every day," Trump said at the time of the flight, dismissing questions about whether it was Russian propaganda.

ABC was first to report last spring that the U.S. was billed some $660K for the Russian aid supplies, which included thousands of pieces of equipment not typically used in hospitals, like chemical warfare-style gas masks and household cleaning gloves.

When asked whether the U.S. would get its money back, a FEMA spokeswoman suggested that money never changed hands because the supplies are now regarded as a "donation."

"Therefore, no payment was required by the U.S. for the donated goods," she said.

New York and New Jersey had received the ventilators but quickly returned them to the federal stockpile without ever having used them, following reports that five coronavirus patients in St. Petersburg were killed in fires linked to overloaded ventilators.

"The donated ventilators in question were disposed of following strict hazardous waste disposal regulatory guidelines," the FEMA spokeswoman said.

ABC News' Anne Flaherty contributed to this report.