President Donald Trump lays a wreath at the Tomb of the Unknown Solider at Arlington National Cemetery, Monday, May 28, 2018, in Arlington, Va. (AP Photo/Evan Vucci)

President Donald Trump lays a wreath at the Tomb of the Unknown Solider at Arlington National Cemetery, Monday, May 28, 2018, in Arlington, Va. (AP Photo/Evan Vucci)

ARLINGTON, Va. (AP) — President Donald Trump paid a Memorial Day tribute at Arlington National Cemetery on Monday, saying he came to “sacred soil” to “honor the lives and deeds of America’s greatest heroes.”

The commander in chief, speaking before an audience of Cabinet members, military leaders, veterans and families assembled in the marble amphitheater near the Tomb of the Unknown Soldier, said, “We mourn alongside their families and we strive to be worthy of their sacrifice.”

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Trump’s somber tone contrasted with a self-promotional tweet earlier Monday in which he said fallen soldiers would be “very proud and happy at how well our country is doing today,” citing the economy and low unemployment.

During his second Memorial Day trip to Arlington as president, Trump laid a wreath at the tomb before making his remarks. He recognized military figures, including Bob Dole, the former senator and 1996 Republican presidential nominee, who served in World War II. And he spoke warmly about a number of military families in attendance, including a young boy named Christian Jacobs, whose father is buried at Arlington.

Trump said the boy showed him his father’s grave last year, calling it “a moment I will always remember.”

Before heading to the hallowed grounds across the Potomac River from the nation’s capital, Trump tweeted that “those who died for our great country would be very happy and proud at how well our country is doing today.”

But the president then veered from the somber to the self-congratulatory in the tweet, citing what he said was the “Best economy in decades, lowest unemployment numbers for Blacks and Hispanics EVER (& women in 18years), rebuilding our Military and so much more. Nice!” The president also posted quotes in line with his criticism of the Justice Department and investigations into ties between his winning campaign and Russia.

He was criticized for his tone by a number of people, including a former chairman of the Joint Chiefs of Staff during the Obama administration, retired Army Gen. Martin Dempsey, who wrote, “This day, of all days of the year, should not be about any one of us.”

Memorial Day messages from first lady Melania Trump and Ivanka Trump, the president’s daughter, struck to a theme of remembrance and thanks.

“As we remember our fallen servicemen and women, our hearts are filled with gratitude for their sacrifice and awe of their courage,” Ivanka Trump tweeted.

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And Melania Trump thanked service members and their families for helping safeguard the country. “We honor the many Americans who laid down their lives for our great country. As one nation under God, we come together to remember that freedom isn’t free,” she tweeted.

At Arlington, Trump said the heroes who died for America “rest in these hallowed fields, in cemeteries, battlefields and burial grounds near and far, and are drawn from the full tapestry of American life.”

He said they came from “every generation, from towering cities and wind-swept prairies, from privilege and from poverty. They were generals and privates, captains and corporals of every race, color and of every creed, but they were all brothers and sisters in arms. And they were all united then, as they are united now, forever, by their undying love of our great country.”

Gen. Joseph Dunford, the current chairman of the Joint Chiefs of Staff, honored the more than a million Americans he said “gave their last full measure so we could live in freedom and raise our children in peace.”

He also honored the families “they left behind and for whom every day is Memorial Day.”

Those who fought and died for America, he said, “shared a commitment to something greater than themselves and they were people who understand what we have in this country is worth fighting for.”

Those who attended the Memorial Day tribute included Trump’s chief of staff, John Kelly, whose son, Marine 2nd Lt. Robert M. Kelly, was killed in November 2010 after he stepped on a land mine while on patrol in southern Afghanistan. He is buried at Arlington.