Fredreka Schouten

USA TODAY

Republican presidential nominee Donald Trump and his joint fundraising committees raised a substantial $90 million last month, according to numbers first reported Wednesday by Fox News.

The haul is an improvement from the $80 million that Trump and the Republican National Committee reported collecting in July and marks the campaign's best fundraising month of the election. But it still falls far short of the $143 million that Clinton reported raising in August for herself and the Democratic National Committee.

Trump campaign officials did not respond to several USA TODAY inquiries Wednesday about their August fundraising performance. Trump's supporters have said he's raising big sums from small donors through digital and direct-mail solicitations.

Presidential candidates don't have to file details about their August fundraising and spending until Sept. 20.

Late Wednesday afternoon, Clinton's camp took note of Trump's reported haul, sending out a fundraising solicitation from campaign manager Robby Mook that warned Clinton was falling short of her September targets.

"There are 62 days left in this election, and if we get outworked or outspent, we're going to lose," Mook said and asked donors to chip in as little as $1.

Team Clinton raised a staggering $143 million in August