Democrats are geared up for the second round of debates, with everyone awaiting the expected showdown between Joe Biden and Kamala Harris following their row last month in Miami.
The debate in Detroit, where Mr Biden and Ms Harris are joined by eight others on stage, comes as Donald Trump has continued to attack congressman Elijah Cummings and the City of Baltimore -- drawing the ire of critics who have called the president's attacks racist.
Mr Biden has promised not to be as nice as he was during his appearance in Miami, but he has continued to combat attacks over his previous positions on civil rights issues that gave Ms Harris an opening in the first debates. But, will any of it matter given Mr Biden's formidable lead in the race? Only time will tell.
Follow live updates
Here's what we know heading into the next month and change: A lot of these candidates are likely to drop out.
Tonight's the last night chance for the candidates to put themselves before a big group of American voters, and perhaps the biggest problem facing many of them will be whether they get fundraising boosts from their performances.
The next debates have stricter qualifying standards — more donors, and higher polling — and so many candidates are likely to find themselves left out.
Candidates are now milling about saying hello to supporters before heading back into the spin room there in Detroit.
Mr Biden finishes up by noting the resiliency of America, before calling for volunteers and donations on his campaign website.
Kamala Harris says "we have a predator living in the White House", parroting some of her previous statements on this issue.
She says that predators prey on weak and vulnerable seeming people.
She says that the Democratic Party needs someone who can prosecute the case against Donald Trump in general election debates.
"We have real crises. The crises is Donald Trump, but it is not only Donald Trump," Mr Booker says.
"The way we beat Donald Trump is not just by focusing on him. ... It's when we focus on each other," Mr Booker says.
Mr Booker starts his farewell remarks by thanking Detroit for hosting the debates.
Andrew Yang began his closing remarks by hitting at the media, which apparently focused on the fact that he did not wear a tie during the last debates.
"Donald Trump has not been bashful in his cruelty, and I am not going to be bashful with my common sense and compassion," Julián Castro says.
Tulsi Gabbard promises to "end these wasteful regime change wars".
Kirsten Gillibrand says Donald Trump has torn at the fabric of American culture, and divided people on a range of metrics.
"I ... know how to beat Donald Trump. He has broken his promises to the American people," Ms Gillibrand says, noting she will make sure she visits all different kinds of communities in America as a Democratic nominee.
Jay Inslee says we "can defeat climate change, and we will defeat Donald Trump. This is our moral responsibility and we will fulfill it."
Who won and who lost the Democratic debate?
10 candidates, and two very different objectives; Joe Biden and Kamala Harris needed an assured performance, everyone else had to make a splashMr Bennet says the US has faced challenges similar to what the US is now acing.
"Now we have a person in the White house who has no appreciate of that history, who doesn't believe in the rule of the law," he says.
Mr de Blasio now says that the president is pitting the races against one another so that the wealthy can benefit.
"This has to be the party that stands for something. This has to be the party of labour unions. This party has to be the party of universal healthcare. This party has to be the party that is not afraid to tax the hell out of the wealthy."
Says Donald Trump is a socialist "for the wealthy".
We're now awaiting closing statements.
Here's from a former communications official for Hillary Clinton:
Julián Castro says he agrees that impeachment proceedings should go forward.
Cory Booker makes the case for starting impeachment proceedings. Ms Harris had said she does not believe Donald Trump is above the law.
"We were all lied to. This is the betrayal, this is the betrayal to the American people, to me, my fellow service members," Ms Gabbard, who enlisted after 9/11, says of the Bush administration's lies that led to the wars in Iraq.
Please allow a moment for our liveblog to load
