RNC officials acknowledged Sunday that they do not have a list of foreign donors to Obama's campaign. Instead, the complaint is based largely on media reports, including one from the conservative Web site Newsmax.
The complaint asks the Federal Elections Commission to audit Obama's campaign fund, RNC chief counsel Sean Cairncross said in a conference call with reporters.
Cairncross said little is known about many of Obama's donors because the campaign is not required to disclose detailed information about people who give less than $200.
The Obama campaign, which is not accepting public funds, has raised more than $468 million. About half has come from small donors, a point of pride for the Obama campaign.
The Obama campaign did not immediately respond to a request for comment.