"It was a little over $600,000, less than $615,000," he told The Hill.

An aide later clarified the candidate raised about $607,000 from July through September.

The former governor was in Washington, D.C. this week for fundraising, which he said is his main focus during this leg of the campaign. Getting the fundraising out of the way now will allow him to focus more time on face-to-face campaigning down the line, and he was able to meet his goal of topping $600,000 in the third quarter.

He said, however, raising money this quarter was more difficult.

"Number one, normal contributors are mad at Washington, D.C. and they don't want to contribute to any candidates because they don't know that any candidates are actually going to get the job done for them," he said.

Rounds also cited a poll that showed him leading his nearest primary challenger by 50 percent which he said "hurt me in the last month."

"People were saying, we don't need to give to you now, we can give to you later. And I worked hard at trying to say, look, if you're gonna contribute please help me by contributing early. Show folks that you're on board with me," he said.

And while he's been able to keep up a consistently strong fundraising pace, Rounds said he's having some difficulty drawing funds from D.C.-based groups.

"Across the country we've met our [fundraising] goals, but in Washington, we've not met the goals that we wanted to meet. And you know the PACs have just said, flat out, we’re not getting money in, or you don’t need it,” Rounds said.

Rounds said, however, he'll be able to draw back his fundraising goal for the campaign, down from $9 million to just $7.5-8 million, as outside groups haven't yet come out attacking him and he hasn't had to spend much of his own money to defend himself.

"We assumed that [$9 million goal] based on the possibility of multiple contenders on the Democratic side, multiple super PACs involved in the race, both Republican and Democrat," he said.

--This piece was updated at 8 p.m.