Trump: If I don't win, campaign was a waste of time
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"The whole thing is about winning," he said during a rally in California on Thursday night. "We can't make the changes if I don't win."
 
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"If I don't win, as good as you say I have done, if I don't win, I will consider it a total and complete waste of time, energy and money," he said.
 
Trump said during the massive rally, which attracted large protests outside, that he is "on the verge of doing something that's really unprecedented."
 
"We're not going to take it," he said.
 
Trump got closer to clinching the nomination Tuesday when he swept all five states voting. The front-runner is hoping to secure the nomination ahead of the Republican National Convention in July.
 
And his competitors are hoping to stop him from getting the 1,237 delegates needed over the course of the remaining primaries, forcing a contested convention.