Democrats take on President Trump in early moments of debate

DETROIT (AP) — Democrats railed against President Donald Trump in the early moments of Wednesday's presidential debate that was expected to test the strength of Joe Biden's candidacy and the extent to which racial politics will shape the road to the White House in 2020.

Biden, the former vice president, said Trump was tearing at the "fabric of America" and highlighted the value of diversity in his opening statement.

"Mr. President, this is America," Biden said of the diverse slate of candidates on stage.

Kamala Harris, who has emerged as one of Biden's chief rivals, also referenced the divisive presidency.

"This becomes a moment we must fight for the best of who we are," Harris said. "We are better than this."

There was an early moment of friction between Harris and Biden over health care. The California senator was widely criticized this week after releasing a plan that would transition to a single-payer government-backed system within 10 years. Biden said that was too long and criticized its cost.

The exchanges came early on the second night of the second round of Democratic debates that pitted the 76-year-old Biden against a younger slate of more diverse candidates. There were no candidates of color on stage in the first wave Tuesday night. On Wednesday night, there were four.

Biden was flanked by Harris on one side and New Jersey Sen. Cory Booker on the other.

Biden expects to face pointed questions about race in particular, having stumbled in the opening debate when confronted by Harris over his record on school integration. Booker in recent days has seized on Biden's decades-old support for criminal justice laws that disproportionately hurt minorities.

Biden's team said that he hopes to focus his attacks on Trump but that he's ready to fight back more aggressively against Harris and Booker if provoked.

Wednesday's debate comes 24 hours after another set of 10 Democrats debated, fiercely at times, over the direction of their party.

In that encounter, Bernie Sanders and Elizabeth Warren faced intense criticism from lesser-known moderates who warned primary voters that a sharp shift to the left on health care and other key policies would make it all but impossible to defeat Trump.

That same dynamic will be on display Wednesday night — only in reverse.

Biden, who leads virtually all early polls, is considered the premier moderate on stage. In addition to Harris and Booker, his more progressive opponents include New York Mayor Bill de Blasio, former Obama administration housing chief Julián Castro, Hawaii Rep. Tulsi Gabbard, New York Sen. Kirsten Gillibrand, Washington Gov. Jay Inslee and entrepreneur Andrew Yang.

While the first primary votes won't come for six more months, there is a sense of urgency for the lower-tier candidates to break out. More than half the field could be blocked from the next round of debates altogether — and possibly pushed out of the race — if they fail to reach new polling and fundraising thresholds implemented by the Democratic National Committee.

The dire stakes have forced many Democrats to turn away from Trump and turn against one another in recent weeks.

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Peoples reported from Washington. Associated Press writer Thomas Beaumont in Detroit contributed to this report.