WASHINGTON (AP) — With sunset remarks and a national moment of silence, President Joe Biden on Monday confronted head-on the country's once-unimaginable loss — half a million Americans in the COVID-19 pandemic — as he tried to strike a balance between mourning and hope.

Addressing the "grim, heartbreaking milestone" directly and publicly, Biden stepped to a lectern in the White House Cross Hall, unhooked his face mask and delivered an emotion-filled eulogy for more than 500,000 Americans he said he felt he knew.

"We often hear people described as ordinary Americans. There's no such thing," he said Monday evening. "There's nothing ordinary about them. The people we lost were extraordinary."

"Just like that," he added, "so many of them took their last breath alone."

A president whose own life has been marked by family tragedy, Biden spoke in deeply personal terms, referencing his own losses as he tried to comfort the huge number of Americans whose lives have been forever changed by the pandemic.

"I know all too well. I know what it's like to not be there when it happens," said Biden, who has long addressed grief more powerfully than perhaps any other American public figure. "I know what it's like when you are there, holding their hands, as they look in your eye and they slip away. That black hole in your chest, you feel like you're being sucked into it."

The president, who lost his first wife and baby daughter in a car collision and later an adult son to brain cancer, leavened the grief with a message of hope.

"This nation will smile again. This nation will know sunny days again. This nation will know joy again. And as we do, we'll remember each person we've lost, the lives they lived, the loved ones they left behind."

He said, "We have to resist becoming numb to the sorrow. We have to resist viewing each life as a statistic or a blur or, on the news. We must do so to honor the dead. But, equally important, to care for the living."

The president ordered flags on federal property lowered to half staff for five days and then led the moment of communal mourning for those lost to a virus that often prevents people from gathering to remember their loved ones. Monday's bleak threshold of 500,000 deaths was playing out against contradictory crosscurrents: an encouraging drop in coronavirus cases and worries about the spread of more contagious variants.

Biden's management of the pandemic will surely define at least the first year of his presidency, and his response has showcased the inherent tension between preparing the nation for dark weeks ahead while also offering optimism about pushing out vaccines that could, eventually, bring this American tragedy to a close.

After he spoke, the president along with first lady Jill Biden, Vice President Kamala Harris and her husband Doug Emhoff stood outside the White House for a moment of silence at sundown. Black bunting draped the doorway they walked through. Five hundred brilliantly lit candles — each standing for 1,000 people lost — illuminated the stairways on either side of them as the Marine Band played a mournful rendition of "Amazing Grace."

The milestone comes just over a year after the first confirmed U.S. fatality from the coronavirus. The pandemic has since swept across the world and the U.S., stressing the nation's health care system, rattling its economy and rewriting the rules of everyday society.

In one of his many symbolic breaks with his predecessor, Biden has not shied away from offering remembrances for the lives lost to the virus. His first stop after arriving in Washington on the eve of his inauguration was to attend a twilight ceremony at the Lincoln Memorial Reflecting Pool to mourn the dead.

That somber moment on the eve of Biden's inauguration — typically a celebratory time when America marks the democratic tradition of a peaceful transfer of power — was a measure of the enormity of loss for the nation.

The COVID-19 death total in the United States had just crossed 400,000 when Biden took the oath of office. An additional 100,000 have died in the past month.

Former President Donald Trump invariably looked to play down the total, initially claiming the virus would go away on its own and later locking into a prediction that America would suffer far fewer than 100,000 deaths. Once the total eclipsed that mark, Trump shifted gears again and said that scale of loss was actually a success story because it could have been much worse.

Outside of perfunctory tweets marking the milestones of 100,000 and 200,000 deaths, Trump oversaw no moment of national mourning, no memorial service. At the Republican National Convention, he made no mention of the suffering, leaving that to first lady Melania Trump.

And at campaign rallies across the nation, he erroneously predicted that the nation was "rounding the corner" on the virus while he disregarded safety measures such as masks and pushed governors to lift restrictions against public health advice. In audio tapes released last fall, it was revealed that Trump told journalist Bob Woodward in March that "I wanted to always play it down. I still like playing it down because I don't want to create a panic."

Biden, by contrast, has long drawn on his own personal tragedy as he comforts those who grieve. He has pledged to level with the American public on the severity of the crisis and has repeatedly warned that the nation was going through a "very dark winter," one now challenged by the arrival of more contagious virus variants.

Biden also has deliberately set expectations low — particularly on vaccinations and when the nation can return to normal — knowing he could land a political win by exceeding them. He is on track to far exceed his initial promise to deliver 100 million vaccinations in his first 100 days, with some public health experts now urging him to set a far more ambitious goal. The administration says it expects to have enough vaccine available for every American by the end of July.

Biden's reference to next Christmas for a possible return to normalcy raised eyebrows across a pandemic-weary nation and seemed less optimistic than projections made by others in his own administration, including Dr. Anthony Fauci, who has suggested a summer comeback.

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Lemire reported from New York.