WASHINGTON

The US president elect Joe Biden has pledged to be “a president who seeks not to divide, but unify” the country during an address to the nation Saturday night from Wilmington, Delaware.

Echoing earlier speeches, Biden said it is “time to put away the harsh rhetoric, lower the temperature, see each other again, listen to each other again.”

Biden urged his supporters to reach out to those who didn’t vote for him, and he acknowledged the disappointment of those who support President Donald Trump.

“I’ve lost a couple times myself,” Biden said. “Now, let’s give each other a chance.”

The president-elect also announced that on Monday he will launch a COVID-19 task force “built on bedrock science” to begin the work of getting control over the pandemic, which Johns Hopkins University data says has infected more than 9.8 million Americans and killed more than 237,000.

A fixture in Washington political circles for nearly a half century, Biden is to be inaugurated Jan. 20, along with Vice President-elect Kamala Harris, currently a U.S senator from California.

Biden was introduced on Saturday night by Harris, the daughter of immigrants who will be the first woman, first African American and first Indian American to serve as vice president.

“When our very democracy was on the ballot in this election, with the very soul of America at stake and the world watching, you ushered in a new day for America,” she said to the cheers of the socially distanced outdoor crowd.

She thanked the voters across the nation for turning out in record numbers and delivering a “clear message: you chose hope, unity, decency, science and, yes, truth,” she said. “You chose Joe Biden as the next president of the United States.”

Harris wore white in tribute to women’s suffrage and opened her remarks with a tribute to the late Georgia Congressman John Lewis, a civil rights champion. She also paid tribute to her mother, Shyamala Gopalan Harris, and the generations of women who came before her.

“While I may be the first woman in this office, I will not be the last,” she said. “Every little girl watching tonight sees that this is a country of possibility.”

Biden, a Democrat who served 36 years in the U.S. Senate and eight years as second in command to former President Barack Obama, was projected as the winner of the U.S. presidency earlier Saturday, after news organizations determined he had gained an insurmountable lead in the vote count in the state of Pennsylvania.

Across the country, his supporters exploded with joy at the news of Biden’s victory, honking car horns in Biden’s home city of Wilmington, Delaware, and pouring into the streets across the nation. A large crowd of celebrants danced and sang in the street in front of the White House in Washington.