MIAMI — The entire field of Democrats in Thursday’s presidential primary debate embraced taxpayer-funded health care for all illegal aliens — in a raucous two-hour affair that saw California Sen. Kamala Harris dominate while former vice president Joe Biden seemed to be lost in the crowd.

All 10 on the stage at the Adrienne Arsht Center for the Performing Arts in Miami — including four of the five who were leading in the polls — raised their hands when asked if government insurance should cover the undocumented.

The visual prompted a mocking reply from President Trump 7,400 miles away.

“All Democrats just raised their hands for giving millions of illegal aliens unlimited health care. How about taking care of American Citizens first!? That’s the end of that race!” he posted from Osaka, Japan, while attending the G20 summit.

But while the others raised their hands high, Biden — who was frequently targeted by his rivals over his record on a host of issues— seemed to hesitate, prompting moderator Savannah Guthrie to ask whether he was raising his hand or seeking to ask a question.

While Biden said he supported the plan, Pete Buttigieg, mayor of South Bend, Ind., offered the only detailed explanation for the move.

“Because our country is healthier when everybody is healthier. This is not about a handout. This is an insurance program,” he said, adding that undocumented immigrants pay taxes that would offset the expense.

“We do ourselves no favors by having 11 million undocumented people in our country be unable to access health care. This is a crazy thing.”

Biden, 76, was also called out on his opposition to forced busing in the 1970s by Harris, 54, who ripped the longtime lawmaker for having recently cited his work with racist Sens. James Eastland of Mississippi and Herman Talmadge of Georgia as an example of how he could work with people despite disagreeing with them.

“I will direct this at Vice President Biden. It was hurtful to hear you talk about the reputations of two United States senators who built their reputations and career on the segregation of race in this country. You also worked with them to oppose busing,” Harris said, after demanding time to speak as the only African-American on the stage.

“There was a little girl in California who was part of the second class to integrate her public school, and she was bused to school every day. That little girl was me. So I will tell you that on this subject, it cannot be an intellectual debate. We have to take it seriously,” she said in a stunning moment of the debate.

Asked if he still opposed busing, Biden struggled to respond, accusing Harris of distorting his record and insisting he only opposed busing ordered by the federal government — before cutting himself off, declaring: “Anyway, my time’s up. I’m sorry.”

The candidates all called for expansion of government health care, though not all were on board with Vermont Sen. Bernie Sanders’ plan to create universal Medicare, which he forcefully advocated.

“I find it hard to believe that every other major country on earth, including my neighbor, 50 miles north of me, Canada, somehow has figured out a way to provide health care to every man, woman, and child, and in most cases spending 50% per capita what we are spending,” the 77-year-old Democratic Socialist said, adding that the US health care system is all about profits for insurance and drug companies.

At one point early on, as candidates talked over one another, Harris took charge.

“America does not want a food fight, we want to know how we put food on the table,” she declared.

New York Sen. Kirsten Gillibrand — who frequently spoke over the moderators in a contest that was far more combative than the first debate the night before — called universal health care a right.

“I believe we need to get to universal health care as a right and not a privilege,” she said.

All of the candidates also excoriated Trump for his policy of separating migrant families at the border.

“A mother who pays a coyote to transport her child through country of Mexico facing unknown peril to come here, why would that mother do that? I will tell you. Because she has decided for that child to remain where they are is worse. But what does Donald Trump do? He says go back to where you came from. That is not reflective of our America and our values and it’s got to end!” Harris said to applause.

Buttigieg, 37, called out Trump’s evangelical supporters for what he called hypocrisy for backing his zero-tolerance immigration policy.

“For a party that associates with Christianity to say it is OK to suggest that God would smile on the division of families at the hands of federal agents, that God would condone putting children in cages has lost all claim to ever use religious language again,” he said.

Biden said his priority would be to get children back with their families.

“I would unite the families immediately. The law now requires the reuniting of those families. We would reunite the families, period,” he said.

Sanders called for a total reversal of Trump’s immigration policies.

“On day one, we take out our executive order and we rescind every damn thing on this issue that Trump has done,” he said.

The candidates also all agreed on the need to fight climate change, enact gun control, fight for abortion rights and other favored liberal issues.

Other candidates on the stage included author Marianne Williamson, ex-Colorado Gov. John Hickenlooper, New York businessman John Yang, Colorado Sen. Michael Bennet and California Rep. Eric Swawell.

Biden is the frontrunner in the Real Clear Politics polling average with 32%, while Sanders has 16.9%, Sen. Elizabeth Warren — who was in Wednesday’s debate — has 12.8%, followed by Harris with 7% and Buttigieg with 6.6%.