Republican presidential candidate Marco RubioMarco Antonio RubioThe Hill's Morning Report — Trump’s walk-back fails to stem outrage on Putin meeting The Memo: Trump allies hope he can turn the page from Russian fiasco Senate weighs new Russia response amid Trump backlash 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 TrumpIran claims it rejected Trump meeting requests 8 times ESPY host jokes Putin was as happy after Trump summit as Ovechkin winning Stanley Cup Russian ambassador: Trump made ‘verbal agreements’ with Putin 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.