Watch: Live updates as Democrats clash in 2020′s opening debate

Democrats face off in a prime-time fight Wednesday night in the first debate of the 2020 presidential campaign, the unofficial starting line for the party’s quest to wrest the White House from Donald Trump and deny him a second term.

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Watch CBSN updates

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The Latest on the Democratic presidential debates (all times local):

10:45 p.m.

The urgency with which to address changes in the world’s climate has emerged as somewhat of a unifying topic at the first Democratic presidential debate.

Washington Gov. Jay Inslee called his state’s progress on the issue the “gold standard.” He said Wednesday that he’s the only member of the massive Democratic field to make tackling the problem his top priority.

Asked how he’d win over voters worried about possible government overreach in climate-related restrictions, former Texas congressman Beto O’Rourke pledged to help communities including the debate host city Miami, an area “on the front lines of climate change today.”

Former Obama-era Cabinet secretary Julián Castro vowed a recommitment to the Paris Climate Accord, while former Maryland Rep. John Delaney noted he was alone in introducing a bipartisan carbon tax bill in Congress.

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10:35 p.m.

Elizabeth Warren’s campaign trail refrain is that she has “a plan for it.” That apparently extends to Senate Republican leader Mitch McConnell, who refused to hold a hearing for President Barack Obama’s last Supreme Court nominee.

Warren was asked during Wednesday’s Democratic presidential debate if she has a plan for dealing with the Kentucky Republican, who prides himself in blocking Democrats’ legislative priorities.

She answered, “I do,” drawing cheers from the audience.

The Massachusetts senator says energized Democrats have to “stay on the front lines,” even after the 2020 presidential election is decided.

She says pressure must be applied both from activists on the outside and leaders on the inside “to make sure this Congress reflects the will of the people.”

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10:20 p.m.

The Democratic presidential candidates are talking in very personal terms about gun violence and how to curb it.

Sen. Cory Booker of New Jersey said at Wednesday’s debate that he lives in a neighborhood where shootings are common. He supports gun licensing and says, “This is not about policy. This is personal.”

Sen. Elizabeth Warren of Massachusetts says the toughest questions she’s gotten on the campaign trail are from kids who ask how she’d keep them safe. Warren says the U.S. should “double-down” on research into what works to reduce gun violence.

New York City Mayor Bill de Blasio (dih BLAH’-zee-oh) talked about raising a black son and trying to keep him safe, including from police.

Wednesday’s debate is taking place in Miami, about 50 miles (80 kilometers) from the high school in Parkland, Florida, where a gunman killed 17 people last year.

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10:10 p.m.

The second hour of the first Democratic presidential debate has been derailed by technical difficulties.

As debate moderators Rachel Maddow and Chuck Todd took over Wednesday for the next round of the debate, the 10 candidates on stage were unable to hear the question Todd was trying to ask about the federal government’s role in getting guns off the street.

Following back-and-forth confusion, Todd announced the debate would head to a commercial break.

It wasn’t immediately clear what happened.

President Donald Trump tweeted that debate hosts NBC and MSNBC “should be ashamed of themselves for having such a horrible technical breakdown in the middle of the debate.”

Trump is en route to Osaka, Japan, for the Group of 20 summit.

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10:05 p.m.

The first hour of the first Democratic presidential debate of the 2020 cycle passed with hardly a mention of the man whom the 10 candidates on stage hope to face next November.

Minnesota Sen. Amy Klobuchar was first to utter President Donald Trump’s name, saying a few minutes into the debate, that Trump “sits in the White House and gloats” while the economy isn’t working for everyone.

She also briefly referenced him again as the debate headed into its second hour. Responding to a question about U.S. tensions with Iran, Klobuchar said, “I don’t think we should conduct foreign policy in our bathrobe at 5 in the morning.”

Other candidates invoked the president’s name in making their arguments on immigration.

Trump was en route to Japan for the G-20 summit as the two-night event got underway. He has weighed in once so far on the debate, tweeting, “BORING!”

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This item has been corrected to show that Klobuchar uttered Trump’s name a few minutes into the debate, not 16 minutes into the debate.

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10 p.m.

Sen. Cory Booker is alone at the Democratic presidential debate in calling it a “mistake” to sign onto the 2015 nuclear accord with Iran.

The New Jersey senator was the only one of the 10 candidates on stage in Miami on Wednesday not to raise his hand when asked if he supported the deal. Under the agreement, Iran agreed to limit its enrichment of uranium and submit to U.N. inspections in exchange for the lifting of economic sanctions.

Pressed to explain his rationale, Booker said as president he would “do the best I can to secure this country.”

President Donald Trump pulled the United States out of the accord in May 2018 and has imposed increasingly tough sanctions to pressure Iran into a better deal. The U.S. has threatened sanctions against countries that trade with Iran.

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9:45 p.m.

The Democratic presidential candidates are decrying the Trump administration’s tough immigration policies, saying the president is to blame for the deaths of an immigrant father and his toddler daughter found lying face-down after drowning in the Rio Grande.

At Wednesday’s debate, former Obama administration housing chief Julián Castro says a photo of the family “is heartbreaking” and “should piss us all off.” He also attacked fellow Texan Beto O’Rourke for not supporting fully decriminalizing the act of crossing the U.S.-Mexico border illegally.

New Jersey Sen. Cory Booker spoke briefly in Spanish to further chastise Trump’s policies, O’Rourke, a former congressman, took a question in Spanish and answered it, saying, “We are going to treat everyone with respect.”

New York City Mayor Bill de Blasio (dih BLAH’-zee-oh) says the economy hasn’t been hurt by immigrants. He says corporations are to blame.

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9:35 p.m.

Questions over private health insurance have provoked the first clash of the Democratic presidential debate.

Former Texas Rep. Beto O’Rourke was explaining Wednesday why he supported a plan known as “Medicare for America” and not “Medicare for All,” saying he wants people who are happy with their current health insurance plan to keep it.

When pressed if he wanted to fully replace private insurance, O’Rourke said: “No.” That prompted New York Mayor Bill de Blasio (dih BLAH’-zee-oh) to jump in from across the stage, saying, “Private insurance is not working.”

O’Rourke started to respond that people unhappy could choose Medicare, but de Blasio shot back, “Why are you defending private insurance?”

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9:30 p.m.

The debate over how to handle private health insurance is emerging as a dividing line in the first 2020 Democratic debate.

Only Massachusetts Sen. Elizabeth Warren and New York City Mayor Bill de Blasio (dih BLAH’-zee-oh) raised their hands when asked if they would abolish private health insurance entirely in favor of a government-run plan.

Warren went on to note that she supports a “Medicare for All” plan proposed by fellow hopeful Vermont Sen. Bernie Sanders.

The issue opened into a debate among many of the 10 candidates on stage on the first of two back-to-back debate nights. De Blasio later interrupted Rep. Beto O’Rourke’s answer on how he’d handle health insurance by declaring that the current system is “not working.”

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9:22 p.m.

President Donald Trump is skipping the opening minutes of the first Democratic debate to greet service members at Alaska’s Elmendorf Air Force Base.

Trump told troops as the debate was starting Wednesday: “I had my choice between you and them. And I chose you.”

Air Force One is refueling at the air base as Trump travels to Osaka, Japan, for meetings with world leaders at the Group of 20 summit. Asked how his opposition will fare, Trump says, “I think they’re all going to do very poorly.”

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9:20 p.m.

Former Texas Rep. Beto O’Rourke showed off his fluent Spanish while answering his first question of the Democratic presidential debate.

O’Rourke said Wednesday in English at the debate in Miami that “this economy has got to work for everyone” and that, right now, it isn’t. Then he switched to Spanish, saying in that language that “we need to include everyone” in a booming national economy.

O’Rourke, who hails from the Texas-Mexico border city of El Paso, spoke in Spanish at length, then switched back to English. He said the Trump administration has focused on helping the wealthy and large corporations over everyday Americans — echoing similar sentiments of the other Democrats on stage.

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9:10 p.m.

Sen. Elizabeth Warren started off the first Democratic presidential debate answering a question about her policy driven campaign and how it may affect what is seen as a good economy.

Warren said Wednesday: “Who is this economy really working for?” She says, “It’s doing great for a thinner and thinner slice at the top.”

The Massachusetts senator says the economy is working well for “giant oil companies” and those who want to invest in private prisons, but not for those struggling and Americans facing the effects of climate change.

The second question of the night went to Sen. Amy Klobuchar on her criticism of the concept of free college.

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9 p.m.

The first debate of the 2020 Democratic presidential race is kicking off with a two-hour event featuring 10 candidates, including three senators, a mayor and several current or former members of Congress.

Sen. Elizabeth Warren of Massachusetts is center stage for Wednesday’s debate in Miami because she leads the night’s field in polling. She is flanked by former Rep. Beto O’Rourke of Texas and Sen. Cory Booker of New Jersey. At the far ends are New York City Mayor Bill de Blasio and former Rep. John Delaney of Maryland, who are polling at the bottom of the group.

The candidates will get right to it. NBC says they will be allowed to give closing statements but no openings.

Ten other candidates will meet Thursday for the second debate night.

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8:55 p.m.

The chairman of the Democratic National Committee is firing up the crowd at his party’s first presidential primary debate — and previewing some lines of attack that candidates will use against President Donald Trump.

Tom Perez said Wednesday that the planet is under threat from unchecked climate change and that justice itself has been threatened under the current administration.

He says the Trump White House is nothing but a long trail of “broken promises” and corruption. There was long applause when Perez said immigrant children shouldn’t be separated from their parents at the U.S.-Mexico border.

Ten Democrats hoping to deny Trump a second term will kick off two nights of back-to-back debates shortly. They entered the stage and waved to the audience before the debate began.