Trump knocks Rubio out, party in chaos

US Republican front-runner Donald Trump swept three states and drove rival Marco Rubio out of the White House race, but the New York billionaire's loss in the crucial state of Ohio wrought more chaos for a party deeply fractured by his candidacy.

While the Republican race remained in turmoil on Tuesday, Hillary Clinton's victories in Florida, Illinois, Ohio and North Carolina cast doubt on US Senator Bernie Sanders's ability to overtake her for the Democratic Party's nomination.

Trump's wins in Florida, Illinois and North Carolina brought him closer to the 1,237 delegates he needs to win the nomination and left those in the party trying to stop him with a dilemma.