Hillary Clinton and Bernie Sanders clashed over immigration and other issues during the Democrat debate in Florida.
The event in Miami took place just days before the next round of primary elections, including Florida.
With 246 delegates, the southern state is the biggest prize.
Bernie Sanders had a surprise win in Michigan on March 8, but Hillary Clinton increased her overall lead with a big win in Mississippi.
In the Republican race that day, Donald Trump won three more states (Michigan, Mississippi and Hawaii) in an attempt to win the Republican nomination. Rival Ted Cruz won a Republican race in Idaho.
The United States last selected candidates to run in the November presidential election.
During the Miami debate, former Secretary of State Hillary Clinton criticized Vermont Sen. Bernie Sanders for voting against immigration reform in 2007.
“Just think, imagine where we would be today if we had achieved a complete immigration reform nine years ago.” she said.
Bernie Sanders responded by saying he had concerns about the treatment of guest workers. The proposed program is “similar to slavery,” he said.
The Vermont senator also said that Hillary Clinton was against allowing illegal immigrants to obtain driver’s licenses.
Nearly two million Spaniards live in Florida and their support will play a big role in the championship on March 15.
Florida is home to nearly 1.8 million Spaniards, including about 15 percent of the state’s Democrats.
Hillary Clinton and Bernie Sanders also discussed job creation, education and climate change.
They both attacked Republican favorite Donald Trump, with Hillary Clinton saying “his trafficking in prejudice and paranoia has no place in our political system.”
Hillary Clinton said that Donald Trump could not even decide “whether to give up the Ku Klux Klan.”
Bernie Sanders, meanwhile, said: “I don’t think the American people will ever elect a president who insults Mexicans, insults Muslims, insults women, insults African Americans.”