Real-estate tycoon Donald Trump blasted the unnamed "bastard" responsible for setting up a faulty sound system at a Wednesday-night campaign rally.
"And by the way, I don't like this mic," Trump said after criticizing US trade policy with China during his speech in Pensacola, Florida.
The Republican presidential front-runner then crudely instructed his staff to not pay the person responsible.
"Whoever the hell brought this mic system, don't pay the son of the b----," he said.
Trump added: "This mic is terrible. Stupid mic keeps popping. Do you hear that George? Don't pay him! Don't pay him. You know, I believe in paying, but when somebody does a bad job like this stupid mic, you shouldn't pay the bastard. Terrible. Terrible. It's true."
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The billionaire businessman said he hoped the sound system was functioning for the packed crowd, but he kept hearing a "boom" sound.
"So we're not going to pay," he continued. "I guarantee you I'm not paying for this mic. Every two minutes I hear like, 'Boom! Boom!'"
Reporters covering the rally said they had difficulty understanding the candidate as well.
Partial transcript of Trump, via this sound system: Mumble, mumble... polls, mumble, Rubio, I like him... The Boston Globe is great...
— Jenna Johnson (@wpjenna) January 14, 2016
Difficult to hear Trump tonight because the mic is pretty fuzzy...lots of echo in the room.
— Ali Vitali (@alivitali) January 14, 2016