“Where’s all this money coming from?” Graham asked in an interview Wednesday with The Hill. “Some of these shadowy figures out there running ads, is there any foreign influence afoot?”

Graham conceded last month that, in fact, he’s getting “killed” by Harrison’s fundraising because his foes “hate my guts.” He pleaded for contributions on Fox News.

Harrison raised a record $57 million, mostly in small, individual contributions, in the third quarter of the year, while Graham raised $28 million. Recent polls give Harrison a slight lead over the three-term incumbent.

“I don’t know what’s going on out there, but I can tell you there’s a lot of money being raised in this campaign,” the senator told The Hill.