Chanting pro-immigrant slogans — “All of us or none of us,” “Democrats deport” and “We are not a bargaining chip” — more than 60 young people overwhelmed a news conference that House Minority Leader Nancy Pelosi had organized Monday on her home turf in San Francisco to urge passage of the Dream Act to protect immigrants who were brought to the country as children.

After nearly an hour of boisterous chanting by protesters who described themselves as “undocumented youth,” Pelosi and fellow House Democrats Barbara Lee of Oakland and Jared Huffman of San Rafael packed up and left as the carefully orchestrated event fell into disarray.

The uproar started as Pelosi finished her opening remarks ahead of several planned speeches from recipients of the Deferred Action for Childhood Arrivals program, or DACA, which the Trump administration rescinded last week. Soon after that, Pelosi and Senate Minority Leader Chuck Schumer, D-N.Y., said they came to an agreement with Trump on the framework for a bill that would protect DACA recipients while beefing up border security.

The dozens of demonstrators unfurled large signs reading “Fight 4 All 11 Million” and “Our Dreams Have No Borders” as they stormed the front of the room at College Track San Francisco on Third Street and encircled the California lawmakers. Pelosi stood uncomfortably, trying to open a discussion with the group only to be repeatedly shouted down.

“Where were you when we asked you to defend our parents?” the group said, using a call-and-response cadence popular during the Occupy movement. “And now you tell us — you have the audacity to tell us — you have been fighting deportation. You are a liar! You are a liar! You are a liar!”

The group called on Pelosi to fight for a “clean bill” that doesn’t make concessions to Trump. Luis Angel, one of the demonstrators, said he fears negotiated trade-offs could “sell out” the roughly 11 million immigrants who are in the U.S. without legal status, even while helping the 690,000 DACA recipients.

Pelosi eventually walked outside to briefly address reporters before leaving.

“This group today is saying don’t do the Dream Act unless you do comprehensive immigration reform,” she said. “Well, we all want to do comprehensive immigration reform. ... I understand their frustration — I’m excited by it as a matter of fact — but the fact is, they’re completely wrong.”

Pelosi pointed out that Democrats have been fighting Trump’s efforts to build a costly border wall with Mexico and his “assault on sanctuary cities,” while seeking to stem an immigration crackdown aimed at increasing deportations. But the incursion by the youth group highlighted continuing divisions on the left over immigration policy and whether Democrats should try to work with Trump when possible.

“I know some people think this hurts the cause of undocumented folks, but undocumented people will always be scapegoated,” said Luis Serrano, one of the group’s organizers. “Pushing Democrats to take a more progressive stance is how we got DACA in the first place. We believe in pushing people who say they’re on our side, not those who are not.”

When Trump ordered an end to the Obama-era DACA policy this month, he called on Congress to pass legislation that would protect recipients, though he did not specify what such a bill should include. Pelosi and Schumer joined Trump on Wednesday for dinner to discuss a potential bipartisan deal on the Dream Act in a rare moment of cooperation between Democratic leadership and the president.

The dinner didn’t sit well with many of those who confronted Pelosi.

“We feel we will be a bargaining chip for Trump to add more border enforcement, and for Democrats to look good,” Serrano said. “It’s a win-win situation for them but not us — the people that are going to be affected.”

Evan Sernoffsky is a San Francisco Chronicle staff writer. Email: esernoffsky@sfchronicle.com Twitter: @evansernoffsky