Donald Trump’s speech was shown at GOP party at the U.S. Grant Hotel. Photo by Ken Stone

Following broad national trends, President Joe Biden and former President Donald Trump swept to victory in San Diego and delegate-rich California on Tuesday, setting up a historic rematch in November’s general election despite low approval ratings for both candidates.

After voting across 15 states where more than one-third of Republican delegates were up for grabs on Super Tuesday, Trump had all but clinched his third consecutive presidential nomination — despite facing a litany of criminal charges.

In a statement, Biden again cast Trump as a threat to American democracy.

“Tonight’s results leave the American people with a clear choice: Are we going to keep moving forward or will we allow Donald Trump to drag us backwards into the chaos, division, and darkness that defined his term in office?” Biden said.

In a victory speech delivered from his Mar-a-Lago estate in Florida, Trump attacked Biden’s immigration policies and called him the “worst president” in history.

Donald Trump’s speech was shown at GOP party at the U.S. Grant Hotel. Photo by Ken Stone

“November 5th is going to go down as the single most important day in the history of our country,” Trump said.

Biden had been expected to sail through the Democratic contests, though a protest vote in Minnesota organized by activists opposed to his forceful support of Israel attracted unexpectedly strong results.

The “uncommitted” vote in Minnesota stood at nearly 20% with more than half the estimated vote counted, according to Edison, higher even than the 13% that a similar effort in Michigan drew last week. Biden nevertheless won Minnesota and 14 other states, including a mail-in vote in Iowa that ended on Tuesday.

He did suffer one loss, in the U.S. territory of American Samoa’s caucus, where entrepreneur Jason Palmer won 51 votes to Biden’s 40, according to the American Samoa Democratic Party.

Another campaign between Trump, 77, and Biden, 81 — the first repeat U.S. presidential matchup since 1956 — is one few Americans seem to want. Opinion polls show both Biden and Trump have low approval ratings among voters.

Immigration and the economy were leading concerns for Republican voters, Edison exit polls in California, North Carolina and Virginia showed. Trump, who frequently denigrates migrants, has promised to mount the largest deportation effort in U.S. history if elected.

Voters were also casting ballots in down-ticket races, including a contest in California to identify potential successors to the late Democratic U.S. Senator Dianne Feinstein.

Monica Mora was among the few Republicans at U.S. Grant Hotel wearing a MAGA hat. Photo by Ken Stone

In Arizona, independent U.S. Senator Kyrsten Sinema, a former Democrat, said she would not run for re-election, setting up a battle for her seat that could determine control of the closely divided Senate next year.

In North Carolina, Trump-endorsed Lieutenant Governor Mark Robinson won the Republican nomination for governor. Robinson, who would be the state’s first Black executive, has drawn criticism for harsh comments about LGBTQ people, women and Muslims.

He will face Democratic Attorney General Josh Stein in what will be one of the most hotly contested governor races in the country. 

Pop megastar Taylor Swift encouraged her fans to vote in a post on Instagram, though she did not endorse specific candidates. Biden’s campaign is hopeful Swift will eventually back his candidacy, as she did in 2020.

Trump won the Republican vote in a dozen states, brushing aside his lone remaining rival, former U.N. Ambassador Nikki Haley, whose campaign no longer has a viable path to the nomination. Her only win of the night thus far came in Vermont, Edison Research projected.

Haley’s challenge has highlighted some of Trump’s potential general election vulnerabilities. She reached 40% in some state contests, performing particularly well among independent, well-educated, and suburban voters who could play a crucial role in battleground states in November.

About one-third of North Carolina voters said Trump would not be fit to serve as president if he was convicted of a crime, while in Virginia, 53% said he would be fit for the office if convicted.

Trump is scheduled to begin his first criminal trial on March 25 in New York, where he is charged with falsifying business records to conceal hush money payments to a porn star during his 2016 presidential run. 

In addition to the New York case, Trump faces separate federal and Georgia state charges for election interference, though it is unclear whether either case will reach trial before November’s election. He also faces federal charges for retaining classified documents after leaving office.

Trump has pleaded not guilty in all four criminal cases.

Biden faces his own weaknesses, including widespread concern about his age. He is already the oldest U.S. president in history.

Reuters contributed to this report.