President Barack Obama called Hillary Clinton and Bernie Sanders on Tuesday night to congratulate them on their Democratic primary race, according to a White House statement.
"The President congratulated Secretary Clinton for securing the delegates necessary to clinch the Democratic nomination for President," the statement read. "Her historic campaign inspired millions and is an extension of her lifelong fight for middle-class families and children."
Obama will also meet with Sanders at the White House on Thursday at Sanders' request.
The statement serves as Obama's first acknowledgment of Clinton's elevation to the presumptive Democratic nominee. Reaching the highest peak yet in a tumultuous and trailblazing political career, Clinton wasted no time Tuesday in wooing Sanders supporters and praising his "extraordinary campaign."
"Thanks to you, we've reached a milestone," Clinton said during a speech in Brooklyn celebrating her status as the presumptive Democratic presidential nominee. "Tonight's victory is not about one person. It belongs to generations of women and men who struggled and sacrificed and made this moment possible."
Her long-awaited moment of celebration comes as six states hold contests that close out a tumultuous primary season. She will notch wins in the New Jersey and New Mexico Democratic primaries, according to CNN projections, adding a slew of delegates to her column.
Clinton took the stage in Brooklyn to an explosion of cheers from her crowd, in the kind of eruption of enthusiasm that has been fleeting during much of her campaign. Clearly delighted, she stood with her arms outstretched on stage, savoring the adulation.
Reaching out to Sanders supporters, Clinton praised the Vermont senator for his long public service and mirrored some of his progressive economic rhetoric. She played down any notion of divisions and their vigorous primary campaign was "very good for the Democratic Party and for America."
Sanders is due to speak later in California and it's unclear whether he'll back down. As Clinton's speech ended, he announced a Thursday rally in Washington, D.C., which holds its primary next week.
Clinton vs. Trump
Clinton was less charitable toward Donald Trump, the presumptive Republican nominee she'll face in a general election campaign that's already turning into one of the nastiest battle's in modern history. She renewed her attack line that the real estate billionaire was "temperamentally unfit" to be president.
"He is not just trying to build a wall between America and Mexico. He is trying to wall of Americans from each other. When he says let's make America great again, that is code for let's take American backwards."
She hit Trump hard for his recent attacks on a judge with Mexican ancestry along with mocking a disabled reporter and "calling women pigs."
"He wants to win by stoking fear and rubbing salt in wounds and reminding us daily just how great he is."
Clinton also signaled a robust challenge to Trump resonating with gender and personal themes. She told how her late mother Dorothy Rodham had taught her "never to back down from a bully."
While the spotlight is on the former secretary of state, Sanders and Trump also face crucial tests.
Sanders, who CNN projects will win the North Dakota caucuses, faces an existential campaign question. He is grappling with whether to honor his vow to fight on to the Democratic National Convention next month or accept the electoral mathematics that give him no viable path to victory and join Clinton to unite a party divided by a much more competitive primary race than expected.
CNN's Brianna Keilar reported that the campaign managers for Clinton and Sanders are in touch, keeping the lines of communication open so they can eventually unify the party, according to a source familiar with the conversations.
The New York Times reported the Sanders campaign is about to undergo a significant reduction in staff. A top campaign official would neither confirm nor deny the report to CNN. But notably, as the campaign reaches the end of the primary season, the campaign has not moved to staff key battleground states and little appears in the works beyond recent promises to fight to the convention.
Trump: 'We are only getting started'
For Trump, the question was how he might extricate himself from the political hole opened up by his controversial comments about a judge of Mexican descent who is overseeing a lawsuit aimed at Trump University.
His accusation that the judge is biased because of his ethnicity has horrified senior GOP leaders who recently reluctantly endorsed him. He tried to neutralize the furor with a statement Tuesday saying his comments had been "misconstrued."
Amid the furor, Trump, who won the Republican contests in New Jersey, New Mexico and South Dakota, delivered a more conventional speech that seemed a departure from the free wheeling approach he often takes. Using a teleprompter -- notable for someone who has blasted Clinton for being scripted -- Trump attacked Clinton and called for GOP unity.
"We are only getting started and it is going to be beautiful," he said.
He didn't mention the judge during his speech and instead sought to convey that he understood his new role as the leader of the GOP.
"I understand the responsibility of carrying the mantle and I will never, ever let you down," he said.
A top campaign adviser told CNN's Jim Acosta that Trump's speech was "very important to recovering from these five bad days."
The dueling public appearances add up to one of the most consequential set piece moments so far in the presidential campaign, with just as much symbolic importance as the party conventions next month and the three presidential debates in the fall. The speeches will set the trajectory of the general election race and ultimately help decide who wins in November.
Clinton reached the magic number of 2,383 delegates needed for the nomination on Monday night after adding the support of several superdelegates.
The former first lady, who has spent a quarter of a century in the national political glare, and weathered a string of controversies, embraced her status as a female icon as never before on Tuesday night, after spending years playing down the historic potential of her career.
The Brooklyn event represents the closing of a personal and political circle as it comes exactly eight years to the day after Clinton folded her 2008 primary campaign against Barack Obama after failing to crack what she described as the "highest, hardest glass ceiling" in American politics.
Sanders' appearance after polls close in California will be closely watched for signs of his intentions. The Vermont senator was once a fringe political figure, but has used a campaign that electrified the Democratic Party's liberal grassroots to emerge as a major figure.
Sanders has his political legacy and future career to consider, as well as what may turn out to be the last rites of his presidential bid. If he decides that it is the end of the road, Sanders must also encourage his fervent supporters to embrace Clinton -- an experience many may find unpalatable after the euphoria of his unlikely insurgent campaign.
Should Sanders win California, he will strengthen his argument for fighting on after the primary season has officially wound down. But should Clinton triumph in a race that polls suggest could be too close to call, she will put an exclamation point on her victory in the four-and-a-half month primary marathon and the pressure for Sanders to quit could become unbearable.
That pressure is rising almost by the hour, with the White House signaling that President Barack Obama, who remains highly popular among Democrats, is readying an endorsement of Clinton within days.
The Sanders campaign is furious at media organizations, including The Associated Press and CNN, which have declared Clinton as the presumptive nominee based on their own calculations of the intentions of superdelegates --- party officials and lawmakers --- who overwhelming favor the former first lady and New York senator.
The campaign argues that since superdelegates do not officially cast their votes until the convention, naming Clinton as the presumptive nominee is premature.
"If you don't have 2,383 in pledged delegates you go to the convention and the super delegates will decide," said Sanders campaign manager Jeff Weaver on CNN's "The Lead" with Jake Tapper. "Even though somebody may be ahead, they have not won if they don't have 2,283 in pledged delegates."
Given the state of the race, it is unlikely Clinton will reach that threshold on pledged delegates alone after the six state races and the District of Columbia primary in a week's time. Still, Clinton will likely capture a majority of pledged delegates -- a milestone that would further hike pressure on Sanders to admit defeat and join her in uniting the Democratic Party to take on Trump.
Democratic strategist Bill Burton predicted that the forces of political gravity would soon begin to take effect. Even if Sanders doesn't immediately drop out, he said, " there is going to be a coalescing of support around Hillary."
"You'll see a large chunk of his supporters start moving away from him, just because people get that the stakes are high here," said Burton, who was Obama's national press secretary during his 2008 campaign. "We're moving toward a general election where if we don't start coalescing -- we're losing days to take this fight to Donald Trump."