A group of 10 Democrats, including some of the top contenders for the 2020 presidential nomination, took the stage Thursday night to round out the first primary election debate.

The major issues of the night — and points of contention among the candidates — included health care, race, gun control and immigration.

Half of the debate participants squared off Wednesday night in Miami, calling for changes to boost the working class and showing competing visions for health care and immigration. Thursday's debate stage featured four of the top five candidates, according to the vast majority of early national and state primary polls: former Vice President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Kamala Harris, D-Calif., and South Bend Mayor Pete Buttigieg.

Presidential contenders started off attacking Trump earlier and more often than the 10 candidates did Wednesday. Sanders, Biden and Harris all targeted the 2017 Republican tax cuts for giving the most relief to corporations and the wealthy. Multiple candidates attacked Trump's immigration policy and separation of migrant children from families.

Meanwhile, Sanders defended his push for single-payer "Medicare for All" — sparking cross talk and shouting across the stage. Both Sanders and Harris said they would scrap the private insurance industry — the only candidates to say so. Former Colorado Gov. John Hickenlooper and Sen. Michael Bennet, D-Colo., argued the system is not feasible.

Biden and Buttigieg, among others, said they prefer a public health care option. Meanwhile, Sen. Kirsten Gillibrand, D-N.Y., said she prefers a transition to Medicare for All without eliminating private insurance.