Senator Bernie Sanders has quit the presidential race, clearing the way for Joe Biden to take on Donald Trump in the November election.
The two politicians, who had spent the last year battling for the Democratic nomination, appeared to put on a united front on Monday.
They appeared together by split-screen on Biden's livecast, where he appealed to all Americans to unite to defeat Trump.
Sanders urged the voters "to come together in this campaign to support (Biden's) candidacy, which I endorse, to make certain that we defeat somebody who I believe ... is the most dangerous president in the modern history of this country."
He put up a united front, telling voters that "it's imperative that all of us work together."
Before the Democratic primary contest was halted due to the pandemic, Biden had secured a commanding edge over Sanders.
Russia has opened a criminal case against Ukrainian President Volodymyr Zelenskiy and put him on a wanted list, the state news agency TASS reported on Saturday, citing the Interior Ministry's database.
The death toll from rains in Brazil's southernmost state of Rio Grande do Sul rose to 56, local authorities said on Saturday morning, while dozens still have not been accounted for.
Hamas has said it is sending a delegation to Cairo on Saturday to discuss a deal for a truce and the release of hostages in Gaza, hours after US CIA Director William Burns arrived in the Egyptian capital, according to Egyptian sources.
NATO's four-month long military exercises near Russia's borders, known as Steadfast Defender, are proof the alliance is preparing for a potential conflict with Russia, a spokeswoman for Russia's Foreign Ministry said on Saturday.