Republican presidential candidate Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE lost his voice on Monday ahead of a campaign event.

Rubio was introduced by South Carolina Gov. Nikki Haley, who endorsed him earlier this month, at the event. Haley told the crowd that Rubio had lost his voice. 

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Rubio proceeded to speak with a hoarse voice after Haley's introduction.
An an earlier event in Tennessee, Rubio vowed to sacrifice his voice for the future of the country and to beat rival Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE.

“We’ve been working hard for you,” he said, according to Breitbart News.

“And if it means by the end of tonight, I don’t have a voice and I have to whisper how strongly I feel about the future of this country, then I’m willing to do it.

“Our Veterans and so many others have given up way much more than just their voice for just one day,” he added.
 
Rubio and Trump have engaged in personal attacks in recent days, mocking each others appearance and background.