The Latest: Trump wins 3 states, but still has work to do

Donald Trump won most of the delegates in Tuesday's contests but he still must do better to win the nomination before the Republican National Convention this summer.

The delegate math highlights the importance of primaries in states like Ohio and Florida, which allocate all of their delegates to the winner.

Republican presidential candidate John Kasich is repeating his prediction that he'll win his home state of Ohio next week and predicts that "will be a whole new ball game" in the campaign sweepstakes.

Republican presidential candidate Donald Trump says there's a need for the party to unite around him, but argues that it isn't yet time for him to dial back his aggressive campaign style.

[...] he also says he was the victim of "vicious" campaign ads on behalf of his rivals last week and that "I didn't set the tone of negativity" in the race.