Donald Trump hasn't spent a dime on TV advertisements

Democratic presidential nominee Hillary Clinton is outspending her Republican rival Donald Trump on TV campaign advertisements despite the mogul's growing fundraising efforts and plummeting poll numbers, according to data collected by NBC.

Clinton's campaign has reportedly spent $52 million on ads in the general election, and that's not counting the $39 million pro-Clinton groups have spent. Trump has yet to buy a single advertisement, though pro-Trump outside groups have spent about $8 million.

Even third-party candidates have even surpassed the Republican presidential nominee in terms of revenue spent on ads. Libertarian Gary Johnson and Green Party nominee Jill Stein spent about $15,000 and $189,000, respectively.

And about $13.6 million of Clinton's funds are financing campaign commercials aired during the 2016 Rio Olympic Summer Games, the Associated Press reported. One particular TV ad features former late night host David Letterman, who hones in on Donald Trump's habit of outsourcing.

Republican ad designer Will Ritter told the AP that Trump's lackadaisical approach to campaign advertisements "cannot survive the professionalized deconstruction that Hillary is doing every day."

"I'd love to know what they're waiting for," he said.

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• Hillary Clinton
• Donald Trump